ADP1653ACPZ-R7 Analog Devices Inc, ADP1653ACPZ-R7 Datasheet - Page 15

• Manufacturer Part Number: ADP1653ACPZ-R7
• Description: IC,Laser Diode/LED Driver,LLCC,16PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Type: Photo Flash LEDr

Specifications of ADP1653ACPZ-R7

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Frequency: 1.2MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 200mA, 500mA
• Internal Switch(s): Yes
• Efficiency: 92%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADP1653ACPZ-R7TR

The LED regulation current levels are controlled by writing to
the ILED and HPLED registers. If the ILED register is set to 0,
the ILED regulator is turned off and no current flows through
the indicator LED. If the ILED register is programmed from
1 (001 binary) to 7 (111 binary), the indicator LED is continuously
on, with a current scaled to the register setting given by
where Code is the ILED register setting. Therefore, the ILED
current can be programmed between 2.5 mA and 17.5 mA,
using the full range of codes.
If the HPLED register is set to 0, the HPLED regulator is turned
off, and no current flows through the high power LED(s). If the
HPLED register is programmed from 1 (00001 binary) to 11
(01011 binary), the regulator is in torch mode, and the HPLED
remains continuously on, independent of the state of STR. If the
HPLED register is programmed between 12 (01100 binary) and
31 (11111 binary), the HPLED regulator remains off until enabled
through the strobe input (STR) or a software strobe command.
To program a desired HPLED current with SETF tied high, use
the following equation:
where Code is the HPLED register setting.
I
I
ILED
HPLED
= 2.5 mA × Code
= 35 mA + Code × 15 mA
SOFTWARE STROBE
CONFIGURATION
OUTPUT SELECT
SW_STROBE
CONDITIONS
OUT_SEL
CONFIG
FAULT
TIMER
FAULT
D7
D7
D7
D7
UNUSED
D6
D6
D6
D6
Figure 28. I
UNUSED
LED CURRENT
HIGH POWER
HPLED<4:0>
Rev. B | Page 15 of 24
D5
D5
D5
D5
(2)
(3)
CONFIGURATION
SHORT-CIRCUIT
2
C Register Assignments
TMR_CFG
UNUSED
FLT_SCP
TIMER
FAULT
D4
D4
D4
D4
OVERTEMPERATURE
FLT_OT
D3
D3
D3
D3
Therefore, the HPLED torch current can be programmed between
50 mA and 200 mA for Code 1 to Code 11, and the HPLED flash
current can be programmed between 215 mA and 500 mA for
Code 12 to Code 31.
Additionally, the HPLED current can be adjusted with an external
resistor. This feature is primarily intended for limiting the LED
flash current in handset applications when the phone’s power
amplifier transmits, but it can also be used to modify the HPLED
current settings. If an external SETF resistor is present, the HPLED
current is given by
TURNING ON THE FLASH AND WATCHDOG TIMER
A watchdog timer is always active in flash mode to prevent
overstress of the HPLED.
In 2-bit logic interface mode, users select flash operation by
setting the CTRL1 pin and the CTRL0 pin high. The watchdog
timer in this mode is fixed at 0.82 sec. Bringing the CTRLx pins
to another state terminates the flash. If the state of the CTRLx
pins remains high for longer than 0.82 sec, flash is automatically
disabled by the watchdog timer, and the interrupt pin ( INT )
goes low to indicate a fault.
FAULT
TMR_SET<3:0>
TIMER PERIOD
I
HPLED
D2
D2
D2
D2
SETTING
INDICATOR LED
ILED<2:0>
CURRENT
=
SOFTWARE STROBE
D1
D1
D1
D1
TIMEOUT FAULT
(
35
SW_STROBE
FLT_TMR
ENABLE
mA
D0
D0
D0
D0
OVERVOLTAGE
+
Code
FLT_OV
FAULT
REG0
REG1
REG2
REG3
×
15
mA)
×
50
R
SETF
kΩ
ADP1653
(4)