MAX6952 MAXIM [Maxim Integrated Products], MAX6952 Datasheet
MAX6952
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MAX6952 Summary of contents
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... LEDs on. The LED drivers are slew rate limited to reduce EMI. For a 2-wire interfaced version, refer to the MAX6953 data sheet kit is available for the MAX6952. Message Boards Audio/Video Equipment ...
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Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V+ .............................................................................-0.3V to +6V All Other Pins................................................-0.3V to (V+ + 0.3V) O0–O13 Sink Current ....................................................... 500mA O14–O23 Source Current ...
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DC ELECTRICAL CHARACTERISTICS (continued) (Typical operating circuit 3.0V to 5.5V, T PARAMETER SYMBOL LOGIC INPUTS AND OUTPUTS Input High Voltage DIN, CLK, CS Input Low Voltage DIN, CLK, CS Input Leakage DIN, CLK, CS, OSC DOUT ...
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Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver (Typical application circuit 3.3V, LED forward voltage = 2.4V, scan limit set to 4 digits, T INTERNAL OSCILLATOR FREQUENCY vs. TEMPERATURE 4. 2.7V ...
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... DIN must be stable when sampled on the rising edge of CLK. DOUT is stable on the rising edge of CLK. Note that while the SPI protocol expects DOUT to be high impedance when the MAX6952 is not being accessed, DOUT on the MAX6952 is never high impedance. Pin Description FUNCTION to set the peak current ...
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... CLK. When sending commands to daisy-chained MAX6952s, all devices are accessed at the same time. An access requires ( clock cycles, where n is the number of MAX6952s connected together. To update just one device in a daisy-chain, MAX6952 the user can send the no-op command (0x00) to the others ...
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... MAX6952. The last bits comprising bits {n-15} to {n} are retained and are parallel loaded into the 16-bit latch as bits D15 to D0, respectively (Figure 4). Reading Device Registers Any register data within the MAX6952 may be read by sending a logic high to bit D15. The sequence is: 1) Take CLK low. ...
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... CLK D15 D13 DIN D14 D12 = 0 DOUT Figure 3. 16-Bit Write Transmission to the MAX6952 CS CLK N-15 N-14 N-13 BIT BIT DIN 1 2 N-31 N-30 N-29 DOUT TIMING NOT TO SCALE. Figure 4. Transmission of More than 16 Bits to the MAX6952 8 _______________________________________________________________________________________ CSS D15 D14 D1 D11 D10 N-8 ...
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Table 4. Register Address Map REGISTER No-Op Intensity10 Intensity32 Scan-Limit Configuration User-Defined Fonts Factory reserved. Do not write to this. Display Test Digit 0 Plane P0 Digit 1 Plane P0 Digit 2 Plane P0 Digit 3 Plane P0 ...
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Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Shutdown Mode (S Data Bit D0) Format The S bit in the configuration register selects shutdown or normal operation (Table 7). The display driver can be programmed ...
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... P0 is used to control the display. The digit data in plane P1 is ignored. Global Blink Timing Synchronization (T Data Bit D4) Format By setting the T bit in multiple MAX6952s at the same time (or in quick succession), the blink timing can be synchronized across all the devices (Table 11). Note that the display multiplexing sequence is also reset, which might give rise to a one-time display flicker when the register is written ...
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... The font address pointer can be written, setting one of 120 addresses between 0x00 and 0xF7, but cannot be read back. The font data is written to and read from the MAX6952 indi- SEGMENT rectly, using this font address pointer. Unused font ...
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... If an exact blink rate is required, use an external clock ranging between 1MHz and 8MHz to drive OSC. The OSC inputs of multi- ple MAX6952s can be tied together to a common exter- nal clock to make the devices blink at the same rate. The relative blink phasing of multiple MAX6952s can be synchronized by setting the T bit in the control register for all the devices in quick succession (Table 11) ...
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... The bit is clear if one or two digits are to be driven, and set if three or four digits are to be driven (Table 20). Change the scan-limit register only when the MAX6952 is in shutdown mode. Intensity Registers Display brightness is controlled digitally by four pulse- width modulators, one for each display digit ...
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... SET Choosing Supply Voltage to Minimize The MAX6952 drives a peak current of 40mA into LEDs with a 2.4V forward-voltage drop when operated from a supply voltage of at least 3.0V. The minimum voltage drop across the internal LED drivers is, therefore (3.0V - 2.4V) = 0.6V higher supply voltage is used, the dri- ver absorbs a higher voltage, and the driver’ ...
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Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Table 18. User-Definable Character Storage Example FONT FONT ADDRESS ADDRESS CHARACTER CODE (HEX) POINTER RAM00 0x00 RAM00 0x01 RAM00 0x02 RAM00 0x03 RAM00 0x04 RAM01 0x05 RAM01 ...
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Table 21. Intensity Register Format for Digit 0 (Address 0x01) and Digit 2 (Address 0x02) TYPICAL SEGMENT DUTY CYCLE CURRENT (mA) 1/16 (min on) 2.5 2/16 5 3/16 7.5 4/16 10 5/16 12.5 6/16 15 7/16 17.5 8/16 ...
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... The MAX6952 operates from a single 2.7V to 5.5V power supply. Bypass the power supply to GND with a 0.1µF capacitor as close to the device as possible. Add a 47µF capacitor if the MAX6952 is not close to the board’s input bulk decoupling capacitor. ✕ 7 matrix digit ...
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COLUMN DRIVER DIGIT 0 DIGIT 0 DIGIT 0 PINS O14-O18 ROW 2 ROW 3 ROW 1 COLUMN DRIVER DIGIT 1 DIGIT 1 DIGIT 1 PINS O19-O23 ROW 2 ROW 3 ROW 1 DIGIT 1 COLUMN DRIVER OUTPUTS ...
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... O23 O22 O21 GND GND O20 O19 O18 MAX6952 O17 O16 O15 O10 13 28 O14 O11 14 27 O13 ISET 15 26 O12 GND 16 25 N.C. BLINK 17 24 OSC DIN 18 ...
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