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ADP1653
2-BIT LOGIC INTERFACE MODE (INTF = 1)
In 2-bit logic interface mode, the two control pins, CTRL1 and
Consequently, the LED current resulting from an external
resistor R SETx is given by the following equation:
CTRL0, select whether the part is disabled or operating in indicator
LED mode, torch mode, or flash mode, as outlined in Table 7.
I LED = I DEFAULT ×
50 kΩ
R SETx
(1)
Table 7. 2-Bit Logic Interface Mode Selection
where I DEFAULT is the LED current resulting from tying the SETx
LED Current
Default Current
pin high.
INTF = 1
Disabled
ILED
Torch
Flash
CTRL1
0
0
1
1
CTRL0
0
1
0
1
Setting Pin
—
SETI
SETT
SETF
(SETx = H)
—
ILED = 10 mA
HPLED = 125 mA
HPLED = 500 mA
The values of I DEFAULT are given in Table 7 for indicator LED mode
(SETI), torch mode (SETT), and flash mode (SETF) operation.
For accurate LED current settings, the minimum SETx resistor
values should be 25 kΩ (SETI, SETT) or 50 kΩ (SETF).
The flash current can be quickly reduced with an external
The LED current levels for indicator LED mode, torch mode,
and flash mode operation are set with separate external resistors
tied between ground and the SETI, SETT, and SETF pins,
respectively. The resulting reference current into each SETx pin
is equal to 1.22 V/R SETx . The reference current multiplied by a
fixed ratio sets the relevant LED current.
Table 8. Reference Current to LED Current Scaling
logic signal (typically 1.8 V logic) by adding a second external
resistor from the SETF pin to the logic signal. Bringing this
digital input from low to high toggles the flash from normal
to reduced current mode by reducing the reference current
supplied to the ADP1653 via the SETF pin (see the Applications
Information section).
I 2 C INTERFACE MODE (INTF = 0)
INTF = 1
Disabled
ILED
Torch
Flash
CTRL1
0
0
1
1
CTRL0
0
1
0
1
LED Current
—
I REF (SETI) × 400
I REF (SETT) × 5200
I REF (SETF) × 20,800
The ADP1653 includes an I 2 C-compatible serial interface for
control of LED current, as well as for readback of system status
registers. The I 2 C chip address is 0x60 (0110 0000 (binary) in
write mode). The default value of all four registers is 0x00.
Registers values are reset to the default values when enable is
brought low, or the VDD supply falls below the undervoltage
Alternatively, a default internal current setting is used by tying
the SETx pin high. The default current for each mode of operation
approximately equals the current obtained with a 50 kΩ resistor
tied from the SETx pin to ground.
(UVLO) level.
Figure 26 illustrates the I 2 C write sequence. The subaddress
content selects which of the four ADP1653 registers is written
to. Figure 27 shows the I 2 C read sequence. The ADP1653 sends
the data from the register denoted by the subaddress. In this
case, the fault register is read (REG3).
The register definitions are shown in Figure 28. The lowest bit
number (0) represents the least significant bit, and the highest
bit number (7) represents the most significant bit.
0 = WRITE
ST
0
1
1
0
0
0
0
0
0
0
0 SP
CHIP ADDRESS
0 = WRITE
SUBADDRESS
Figure 26. I 2 C Write Sequence
ADP1653 RECEIVES DATA
1 = READ
ST
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
ST
0
1
1
0
0
0
0
1
0
1 SP
CHIP ADDRESS
SUBADDRESS
CHIP ADDRESS
ADP1653 SENDS DATA
Figure 27. I 2 C Read Sequence
Rev. B | Page 14 of 24
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