ADP8866 Analog Devices, ADP8866 Datasheet
ADP8866
Specifications of ADP8866
Related parts for ADP8866
ADP8866 Summary of contents
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... V Small lead frame chip scale package (LFCSP) GENERAL DESCRIPTION The ADP8866 combines a programmable backlight LED charge pump driver with automatic blinking functions. Nine LED drivers can be independently programmed at currents mA. The current level, fade time, and blinking rate can be programmed once and executed autonomously on a loop ...
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... ADP8866 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Typical Operating Circuit ................................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Maximum Temperature Ranges ................................................. 5 Thermal Resistance ...................................................................... 5 ESD Caution .................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 11 Power Stage.................................................................................. 12 Operating Modes ........................................................................ 13 LED Groups................................................................................. 14 Output Current Settings ............................................................ 14 Output Current Range Selection ...
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... The delay after gain has changed and before gain is allowed to change again 0.8 × OUT IN V rising OUT V falling OUT Rev Page ADP8866 = 1 μF, typical values are at OUT = −40°C to +105°C, unless otherwise noted. J Min Typ Max 2.5 5.5 1.98 2.25 1.75 1. ...
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... ADP8866 Parameter Symbol Thermal Shutdown Threshold TSD Hysteresis TSD (HYS) Isolation from Input to I OUTLKG Output During Fault Time to Validate a Fault t FAULT I C INTERFACE 2 V Voltage Operating Range V DDIO DDIO Logic Low Input V IL Logic High Input TIMING SPECIFICATIONS ...
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... Unless otherwise specified, all voltages are referenced to GND. MAXIMUM TEMPERATURE RANGES The maximum operating junction temperature (T supersedes the maximum operating ambient temperature (T ). Therefore, in situations where the ADP8866 is A(MAX) exposed to poor thermal resistance and a high power dissipation (P ), the maximum ambient temperature may need to be derated. D ...
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... SDA I C Serial Data Input. Requires an external pull-up resistor SCL Clock Input. Requires an external pull-up resistor GND VIN ADP8866 13 VOUT D1 3 TOP VIEW 4 12 C2+ D9 nRST 5 11 C1+ (Not to Scale) NOTES 1. CONNECT THE EXPOSED PADDLE TO GND. Figure 3. LFCSP Pin Configuration ...
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... IN Figure 7. Typical Off Time Current (I Q(OFF) 1.0 SCL = SDA = 0V 0.9 +105°C +85°C 0.8 +25°C –40°C 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2.5 3.0 3.5 4.0 4.5 V (V) IN Figure 8. Typical Standby I Q 27.0 26.5 26.0 25.5 25.0 24.5 24.0 23.5 23.0 2.5 3.0 3.5 4.0 4.5 V (V) IN Figure 9. Typical Diode Current vs. V ADP8866 = 25°C, A +105°C +85°C +25°C –40°C 5.0 5.5 ) 5.0 5.5 +105°C +85°C +25°C –40°C 5.0 5.5 IN ...
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... ADP8866 1.6 I D1:D9 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 2.5 3.0 3.5 4.0 V (V) IN Figure 10. Typical Diode Matching vs. V 27.0 26.5 26.0 25.5 25.0 24.5 24.0 23.5 23.0 0.2 0.4 0.6 0.8 1.0 1.2 V (V) HR Figure 11. Typical Diode Matching vs. Current Sink Headroom Voltage (V 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 V (V) HR Figure 12. Typical Diode Current vs. Current Sink Headroom Voltage (V 0.1 = 25mA –0.1 –0.2 –0.3 –0.4 –0.5 +105°C +85°C –0.6 +25°C –40°C –0.7 – ...
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... Figure 20. Typical Regulated Output Voltage (V SS 6.0 5.9 5.8 5.7 5.6 5.5 5.4 5.3 +85°C +25°C –40°C 5.2 5.1 5.0 –40 80 100 Figure 21. Typical Overvoltage Protection (OVP) Threshold = 300 Hz) Rev Page ADP8866 V , +25° +25° –40° –40° +85° +85° +105° +105° ...
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... ADP8866 100 2.5 3.0 3.5 4.0 V (V) IN Figure 22. Typical Efficiency (Each LED Set 1µ 1µ 1µ 1µF IN OUT 120mA OUT V (AC-COUPLED) 50mV/DIV (AC-COUPLED) 50mV/DIV OUT 2 I (AC-COUPLED) 10mA/DIV IN 3 1µs/DIV Figure 23. Typical Operating Waveforms 1× ...
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... THEORY OF OPERATION The ADP8866 combines a programmable backlight LED charge pump driver with automatic blinking functions. Nine LED drivers can be independently programmed at currents mA. The current level, fade time, and blinking rate can be programmed once and executed autonomously on a loop. Separate fade-in and fade-out times can be set for the backlight LEDs ...
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... LEDs. Because a fixed charging and discharging combination must be used, only certain multiples of gain are available. The ADP8866 is capable of automatically optimizing the gain (G) from 1×, 1.5×, and 2×. These gains are accomplished with two capacitors and an internal switching network 1× ...
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... C commands are acknowledged (all registers are kept C commands. 2 nRST MUST BE HIGH FOR 20µs (MAX) 2 BEFORE SENDING I C COMMANDS nRST IS LOW, WHICH FORCES nSTBY LOW 2 AND RESETS ALL I C REGISTERS GAIN CHANGES ONLY OCCUR WHEN NECESSARY BUT HAVE A MINIMUM TIME BEFORE CHANGING SOFT START ADP8866 C receivers. 2 ...
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... DxLVL bits in Register 0x07 and Register 0x08. PWM DIMMING Setting the LEVEL_SET code to 111111 (binary) allows the ADP8866 to dim its LEDs based on a PWM signal applied to the nINT pin. The LED output current is pulse width modulated with the signal applied to the nINT pin. The typical waveform and timing are shown in Figure 29 ...
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... BLMX register is updated as often as 60 times per second. And the changes to BLMX must be implemented as soon as possible. Therefore, the ADP8866 has a unique mode that allows the backlight to have very fast changes after the initial ramp in and ramp out. This mode is (4) entered when CABCFADE in Register 0x10 is set high ...
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... ADP8866 Program all fade-in and fade-out timers before enabling any of the LED current sinks. If ISCx is on during a blink cycle and SCx_EN in Register 0x1B is cleared, it turns off (or fades to off if fade-out is enabled). If ISCx is off during a blink cycle and SCx_EN is cleared, it stays off. ADVANCED BLINKING CONTROLS ...
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... An interrupt flag is set at each OVP instance. THERMAL SHUTDOWN (TSD)/OVERTEMPERATURE PROTECTION If the die temperature of the ADP8866 rises above a safety limit (150°C typical), the controllers enter TSD protection mode. In (4.9 V OUT(REG) this mode, most of the internal functions are shut down, the part enters standby, and the TSD_INT interrupt is set (see Register 0x02) ...
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... ADP8866 1 VOUT < V – OVP V (HYS) OVP 0 V > V OUT OUT(REG) OVP FAULT TRY TO REGULATE VOUT OUT(REG) VOUT > V OVP 1 VOUT < V – OVP V OVP (HYS > V OUT OUT(REG) OVP FAULT TRY TO REGULATE VOUT OUT(REG) VOUT > V OVP ...
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... INTERRUPTS There are four interrupt sources available on the ADP8866. • Independent sink off: when all independent sinks that are assigned with the DxOFFINT bits high in Register 0x04 and Register 0x05 have faded to off, this interrupt (ISCOFF_INT, Register 0x02) is set. • Backlight off: at the end of each automated backlight fade- out, this interrupt (BLOFF_INT, Register 0x02) is set. • ...
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... OUT • and produces an IR The ADP8866 has an integrated noise filter on the nRST pin. Under normal conditions not necessary to filter the reset line. However, if exposed to an unusually noisy (6) signal beneficial to add a small RC filter or bypass resistance for the capacitor on this pin ...
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... I C PROGRAMMING AND DIGITAL CONTROL 2 The ADP8866 provides full software programmability to facilitate its adoption in various product architectures. The I address is 0100111x ( during write during read). Therefore, the write address is 0x4E, and the read address is 0x4F. Notes on the general behavior of registers: • ...
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... ADP8866 REGISTER DESCRIPTIONS Table 8. Register Map Address Name Bit 7 0x00 MFDVID 0x01 MDCR Reserved 0x02 INT_STAT Reserved 0x03 INT_EN Reserved 0x04 ISCOFF_SEL1 0x05 ISCOFF_SEL2 D8OFFINT 0x06 GAIN_SEL 0x07 LVL_SEL1 Reserved 0x08 LVL_SEL2 D8LVL 0x09 PWR_SEL1 0x0A PWR_SEL2 D8PWR 0x0B to 0x0F Reserved ...
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... LEDs are off. The charge pump switches up in gain as needed. This feature is useful if the ADP8866 charge pump is used to drive an external load the charge pump automatically switches up and down in gain. This provides optimal efficiency but is not suitable for driving external loads (other than those connected to the ADP8866 diode drivers) ...
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... ADP8866 Interrupt Status Register (INT_STAT)—Register 0x02 Table 12. INT_STAT Bit Map Bit 7 Bit 6 Bit 5 Reserved ISCOFF_INT BLOFF_INT Table 13. Bit Name Bit No. Description N/A 7 Reserved. ISCOFF_INT 6 Independent sink off indicates that the controller has ramped all the independent sinks designated in Register 0x04 and Register 0x05 to off ...
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... Diode the group that triggers an ISCOFF_INT. When Diode 3 and all other LEDs with DxOFFINT are set high and goes from on to off, ISCOFF_INT is set Diode 3 is not in the group that triggers an ISCOFF_INT when all diodes in that group are off. Rev Page ADP8866 Bit 2 Bit 1 Bit 0 ...
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... ADP8866 Bit Name Bit No. D2OFFINT 1 D1OFFINT 0 Charge Pump Gain Selection (GAIN_SEL)—Register 0x06 Table 20. GAIN_SEL Bit Map Bit 7 Bit 6 Bit 5 Reserved Table 21. Bit Name Bit No. N/A 7:3 1.5X_LIMIT 2 G_FORCE [1:0] Output Level Selection 1 (LVL_SEL1)—Register 0x07 Table 22. LVL_SEL1 Bit Map Bit 7 Bit 6 Reserved D9LVL Table 23 ...
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... LEVEL_SET bits normal mode (25 mA full-scale current). Diode 7 level select control with the LEVEL_SET bits normal mode (25 mA full-scale current). Diode 6 level select control with the LEVEL_SET bits normal mode (25 mA full-scale current). Rev Page ADP8866 N Maximum Current Range (mA) 4 6.25 4.1 6.10 4.2 5.95 4 ...
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... ADP8866 Bit Name Bit No. D5LVL 4 D4LVL 3 D3LVL 2 D2LVL 1 D1LVL 0 LED Power Source Selection 1 (PWR_SEL1)—Register 0x09 Table 27. PWR_SEL1 Bit Map Bit 7 Bit 6 Bit 5 Table 28. Bit Name Bit No. Description N/A [7:1] Reserved. D9PWR 0 Diode 9 LED power source select the LED is powered from the battery or other power source. ...
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... LED6 as part of the independent sinks group selects LED6 as part of the backlight group. Bit 4 Bit 3 D9SEL CABCFADE Bit 5 Bit 4 Bit 3 D6SEL D5SEL D4SEL Rev Page Bit 2 Bit 1 Bit 0 BL_LAW Reserved 2 C setpoint after the backlight is enabled and the fade- Bit 2 Bit 1 D3SEL D2SEL ADP8866 Bit 0 D1SEL ...
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... ADP8866 Bit Name Bit No. Description D5SEL 4 Diode 5 backlight select selects LED5 as part of the independent sinks group selects LED5 as part of the backlight group. D4SEL 3 Diode 4 backlight select selects LED4 as part of the independent sinks group selects LED4 as part of the backlight group. D3SEL 2 Diode 3 backlight select. ...
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... Rev Page ADP8866 Bit 2 Bit 1 Bit 0 Current (mA) Current (mA) (Full Scale = (Full Scale = 6.25 mA) 5.0 mA) LEVEL_SET = LEVEL_SET = 100000 101010 0.0 0.0 0.0004 0.0003 0.0016 0.0012 ...
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... ADP8866 Current (mA) (Full Scale = 25 mA) DAC Code LEVEL_SET = 000010 0x1D 1.30 0x1E 1.40 0x1F 1.49 0x20 1.59 0x21 1.69 0x22 1.79 0x23 1.90 0x24 2.01 0x25 2.12 0x26 2.24 0x27 2.36 0x28 2.48 0x29 2.61 0x2A 2.73 0x2B 2.87 0x2C 3.00 0x2D 3.14 0x2E 3.28 0x2F 3.42 0x30 3.57 0x31 3.72 0x32 3.88 0x33 4.03 0x34 4.19 0x35 4.35 0x36 4.52 0x37 4.69 0x38 4.86 0x39 5.04 0x3A 5.21 0x3B 5.40 0x3C 5 ...
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... Current (mA) Current (mA) (Full Scale = 12.5 mA) (Full Scale = 8.25 mA) LEVEL_SET = 001100 LEVEL_SET = 010110 4.96 3.31 5.08 3.39 5.21 3.47 5.34 3.56 5.47 3.65 5.60 3.73 5.73 3.82 5.87 3.91 6.00 4.00 6.14 4.09 6.28 4.19 6.42 4.28 6.56 4.37 6.70 4.47 6.85 4.57 6.99 4.66 7.14 4.76 7.29 4.86 7.44 4.96 7.60 5.06 7.75 5.17 7.91 5.27 8.06 5.38 8.22 5.48 8.38 5.59 8.54 5.70 8.71 5.81 8.87 5.92 9.04 6.03 9.21 6.14 9.38 6.25 9.55 6.37 9.72 6.48 9.90 6.60 10.1 6.71 10.2 6.83 10.4 6.95 10.6 7.07 10.8 7.19 11.0 7.32 11.2 7.44 11.3 7.56 11.5 7.69 11.7 7.82 11.9 7.94 12.1 8.07 12.3 8.20 12.5 8.33 Rev Page ADP8866 Current (mA) Current (mA) (Full Scale = 6.25 mA) (Full Scale = 5.0 mA) LEVEL_SET = 100000 LEVEL_SET = 101010 2.48 1.98 2.54 2.03 2.61 2.08 2.67 2.14 2.73 2.19 2.80 2.24 2.87 2.29 2.93 2.35 3.00 2.40 3.07 2.46 3.14 2.51 3.21 2.57 3.28 2.62 3.35 2.68 3.42 2.74 3.50 2.80 3.57 2.86 3.65 2.92 3.72 2.98 3.80 3.04 3.88 3.10 3.95 3.16 4.03 3.23 4.11 3.29 4.19 3.35 4.27 3.42 4.35 3.48 4.44 3.55 4.52 3.62 4.60 3.68 4.69 3.75 4.77 3.82 4.86 3.89 4.95 3.96 5.04 4.03 5.12 4.10 5.21 4.17 5.30 4.24 5.40 4.32 5.49 4.39 5.58 4.46 5.67 4.54 5.77 4.61 5.86 4.69 5.96 4.77 6.05 4.84 6.15 4.92 6.25 5.00 ...
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... ADP8866 INDEPENDENT SINK REGISTER DESCRIPTIONS Independent Sink Current Control Register 1 (ISCC1)—Register 0x1A Table 40. ISCLAW Bit Map Bit 7 Bit 6 Bit 5 Reserved Table 41. Bit Name Bit No. Description N/A 7:3 Reserved. SC9_EN 2 This enable acts on LED9 SC9 is turned on SC9 is turned off. SC_LAW 1:0 SC fade transfer law. ...
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... An independent sink remains on continuously when it is enabled and SCxOFF is disabled. Independent Sink Current Time (ISCT2)—Register 0x1D Table 46. ISCT2 Bit Map Bit 7 Bit 6 Bit 5 SC4OFF Bit 4 Bit Bit 4 Bit 3 SC3OFF Rev Page Bit 2 Bit 1 Reserved SC5OFF Bit 2 Bit 1 SC2OFF SC1OFF ADP8866 Bit 0 Bit 0 ...
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... ADP8866 Table 47. Designation Bit Description 1 SC4OFF [7:6] SC4 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the SCON setting ...
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... Setting SCxOFF to off causes the LED to be held off indefinitely. This is useful for setting up a blink sequence that runs once and then goes to off. Bit 4 Bit 3 SC7OFF Bit 4 Bit 3 SC8OFF Rev Page ADP8866 Bit 2 Bit 1 Bit 0 Bit 2 Bit 1 Bit 0 ...
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... ADP8866 Independent Sink 9 Off Timer (OFFTIMER9)—Register 0x21 Table 54. OFFTIMER9 Bit Map Bit 7 Bit 6 Bit 5 Reserved Table 55. Bit Name Bit No. Description N/A 7 Reserved. SC9OFF [6:0] SC9 off time. When the SC off time is disabled, the SC remains on while enabled. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the SCON setting ...
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... Current (mA) Current (mA) (Full Scale = (Full Scale = 12.5 mA) 8.25 mA) LEVEL_SET=001100 LEVEL_SET=010110 0.0 0.0 0.0008 0.0005 0.0031 0.0021 0.0070 0.0047 … … 12.5 8.33 Rev Page ADP8866 Bit 2 Bit 1 Bit 0 Current (mA) Current (mA) (Full Scale = (Full Scale = 6.25 mA) 5.0 mA) LEVEL_SET = LEVEL_SET = 100000 101010 0.0 0.0 0.0004 0.0003 0.0016 0.0012 0.0035 0.0028 … ...
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... ADP8866 Sink Current Register LED3 (ISC3)—Register 0x25 Table 62. ISC3 Bit Map Bit 7 Bit 6 Reserved Table 63. Bit Name Bit No. Description N/A 7 Reserved. SCD3 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values. Current (mA) (Full Scale = 25 mA) ...
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... Scale = 12.5 mA) 8.25 mA) LEVEL_SET = 001100 LEVEL_SET = 010110 0.0 0.0 0.0008 0.0005 0.0031 0.0021 0.0070 0.0047 … … 12.5 8.33 Bit 4 Bit 3 SCD7 Rev Page ADP8866 Current (mA) Current (mA) (Full Scale = (Full Scale = 5.0 mA) 6.25 mA) LEVEL_SET = LEVEL_SET = 100000 101010 0.0 0.0 0.0004 0.0003 0.0016 0.0012 0.0035 0.0028 … … 6.25 5 ...
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... ADP8866 Table 71. Bit Name Bit No. Description N/A 7 Reserved. SCD7 [6:0] Sink current. All values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values. Current (mA) (Full Scale = 25 mA) DAC Code LEVEL_SET = 000010 0x00 0.0 0x01 0.0016 0x02 0.0062 0x03 0.014 … … 0x7F 25.0 Sink Current Register LED8 (ISC8)— ...
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... LEVEL_SET = LEVEL_SET = 001100 010110 0.0 0.0 0.0008 0.0005 0.0031 0.0021 0.0070 0.0047 … … 12.5 8.33 Bit 5 Bit 4 Bit 3 SCD7_HB Rev Page ADP8866 Bit 2 Bit 1 Bit 0 D8HB_EN D7HB_EN D6HB_EN Bit 2 Bit 1 Bit 0 Current (mA) Current (mA) (Full Scale = (Full Scale = 6.25 mA) 5.0 mA) LEVEL_SET = LEVEL_SET = 100000 101010 0.0 0.0 0.0004 ...
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... ADP8866 Table 81. Bit Name Bit No. Description N/A 7 Reserved. SCD7_HB [6:0] Sink current for the even numbered pulses when heartbeat mode for this channel is enabled. Use the following DAC code schedule. See Table 39 for a complete list of values. Current (mA) (Full Scale = 25 mA) DAC LEVEL_SET = Code ...
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... Bit 5 Bit 4 Bit 3 SC6OFF_HB Bit 5 Bit 4 Bit 3 SC7OFF_HB Rev Page ADP8866 Current (mA) Current (mA) (Full Scale = (Full Scale = 5.0 mA) 6.25 mA) LEVEL_SET = LEVEL_SET = 100000 101010 0.0 0.0 0.0004 0.0003 0.0016 0.0012 0.0035 0.0028 … … 6.25 5.0 Bit 2 Bit 1 ...
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... ADP8866 Table 89. Bit Name Bit No. Description N/A 7 Reserved. SC7OFF_HB [6:0] SC7 off time for the even numbered pulses when heartbeat mode for this channel is enabled. When the SC7OFF_HB time is disabled, SC7 goes immediately from the even numbered on time to the odd numbered on time. When the SC off time is set to any other value, the ISC turns off for the off time (per the following listed times) and then turns on according to the SCON7_HB setting ...
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... Enable Delay Time for SC6 (DELAY6)—Register 0x3C Table 96. DELAY6 Bit Map Bit 7 Bit 6 Reserved Bit 4 Bit 3 Bit 5 Bit 4 Bit 3 DELAY6 Rev Page ADP8866 Bit 2 Bit 1 Bit 0 SCON_HB Bit 2 Bit 1 Bit 0 ...
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... Bit No. Description N/A 7 Reserved. DELAY8 [6:0] Enable delay time for SC8. When SC8 is enabled, the ADP8866 automatically waits the specified time before starting the SC8 fade-in. 0000 = 0 ms (no delay when SC8 enable is exercised). 0000001 = 10 ms. 0000010 = 20 ms. 0000011 = 30 ms. … 1111111 = 1270 ms. ...
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... Bit No. Description N/A 7 Reserved. DELAY9 [6:0] Enable delay time for SC9. When SC9 is enabled, the ADP8866 automatically waits the specified time before starting the SC9 fade-in. 0000 = 0 ms (no delay when SC9 enable is exercised). 0000001 = 10 ms. 0000010 = 20 ms. 0000011 = 30 ms. … 1111111 = 1270 ms. ...
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... Figure 42. 20 Lead Lead Frame Chip Scale Package [LFCSP_WQ × Body, Very Very Thin Quad (CP-20-10) Dimensions shown in millimeters DIRECTION OF FEED Figure 43. Tape and Reel Orientation for LFCSP Units Package Description 20-Lead LFCSP_WQ, 7“ Tape and Reel ADP8866 Daughter Card and LED Board Rev Page 2.65 2. ...
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... NOTES Rev Page ADP8866 ...
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... ADP8866 NOTES I C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). 2 ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09478-0-3/11(0) Rev Page ...