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X R P 7 6 2 0
4 - C h a n n e l A d j u s t a b l e C u r r e n t I 2 C C o n t r o l l e d L E D D r i v e r
THEORY OF OPERATION
I 2 C SERIAL INTERFACE
The XRP7620 has five data registers which can
be programmed serially through the I2C
interface. The first register is a status register
which has two bits used for shutdown/power
up options, 4 bits used for individual LED
ON/OFF control, one bit for over-temperature
readback and one bit for undervoltage lockout
LED Registers (x4)
LED register bits B7-B2
In LED registers bits B7, B6, B5, B4, B3 and
B2 represent the DAC codes D5-D0 used to set
the LED current in the four LEDs, and B1 and
B0 are not used. The following table lists the
DAC codes and the corresponding current for
each channel in mA:
B7-B2 Current mA B7-B2 Current mA
readback. The next four registers are used to
set the brightness levels of the four LEDs.
000000
000001
000010
000011
0
0.5
1.0
1.5
100000
100001
100010
100011
16.0
16.5
17.0
17.5
B7
B6
B5
B4
B3
B2
B1
B0
000100
2.0
100100
18.0
Status WZ
WP
LED4 LED3 LED2 LED1
OVT
UVL
000101
2.5
100101
18.5
LED1
LED2
LED3
LED4
D5
D5
D5
D5
D4
D4
D4
D4
D3
D3
D3
D3
D2
D2
D2
D2
D1
D1
D1
D1
D0
D0
D0
D0
-
-
-
-
-
-
-
-
000110
000111
001000
001001
3.0
3.5
4.0
4.5
100110
100111
101000
101001
19.0
19.5
20.0
20.5
Table 1: XRP7620 I C Register Bit Map
2
Status Register
Status register bits B7 and B6
The following table defines the states for bits
B7 and B6 of the STATUS register. They are
used to put the XRP7620 into shutdown,
standby, or active mode.
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
21.0
21.5
22.0
22.5
23.0
23.5
24.0
24.5
25.0
25.5
WZ
0
WP
0
State
Shutdown and reset
registers to 00000000
I Q
0μA
LED Driver
Off
010100
010101
010110
10.0
10.5
11.0
110100
110101
110110
26.0
26.5
27.0
1
0μA
Off
0
30μA
Off
0
1
1
Shutdown
Keeps registers contents
Standby
Keeps registers contents
1 Active Active On
Table 2: XRP7620 Status Register Bits B7 and B6
010111
011000
011001
011010
011011
011100
11.5
12.0
12.5
13.0
13.5
14.0
110111
111000
111001
111010
111011
111100
27.5
28.0
28.5
29.0
29.5
30.0
Status register bits B5-B2
011101
14.5
111101
30.5
These bits are to control the LED On/Off
individually. Putting 1 (logic high) will enable
the driver and putting 0 (logic low) will disable
011110
011111
15.0 111110
15.5 111111
Table 3: LED Current DAC Settings
31.0
31.5
the driver.
Status register bits B1 and B0
These bits are the readback bits. Their values
are 0 for normal operations. If over-
temperature is detected, B1=1, and If
undervoltage is detected, B0=1.
threshold is approximately 2.4V.
The UVL
? 2012 Exar Corporation
8/11
Rev. 1.1.0
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