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ADP1653
OUT_SEL
OUTPUT SELECT
D7
D6
D5
D4
D3
D2
D1
D0
REG0
HPLED<4:0>
HIGH POWER
LED CURRENT
ILED<2:0>
INDICATOR LED
CURRENT
CONFIG
TIMER
CONFIGURATION
D7
D6
D5
D4
D3
D2
D1
D0
REG1
UNUSED
TMR_CFG
TIMER
CONFIGURATION
TMR_SET<3:0>
TIMER PERIOD
SETTING
SW_STROBE
SOFTWARE STROBE
D7
D6
D5
D4
D3
D2
D1
D0
REG2
UNUSED
SW_STROBE
SOFTWARE STROBE
ENABLE
FAULT
FAULT
CONDITIONS
D7
D6
D5
D4
D3
D2
D1
D0
REG3
UNUSED
FLT_SCP
SHORT-CIRCUIT
FAULT
FLT_OT
OVERTEMPERATURE
FAULT
Figure 28. I 2 C Register Assignments
FLT_OV
OVERVOLTAGE
FAULT
FLT_TMR
TIMEOUT FAULT
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
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
I ILED = 2.5 mA × Code
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.
(2)
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
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
I HPLED = ( 35 mA + Code × 15 mA) ×
50 kΩ
R SETF
(4)
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:
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
I HPLED = 35 mA + Code × 15 mA
where Code is the HPLED register setting.
(3)
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.
Rev. B | Page 15 of 24
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