LED1642GW datasheet(18/42 Pages) STMICROELECTRONICS

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Configuration register

LED1642GW

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DocID024395 Rev 6

Configuration register

The configuration register is used to enable or disable some device features, to program

some parameters and to change other settings. The access to this register (read or write) is

managed to find a description for each bit as described in Table 8. The default value of the

configuration register (when the device is switched on or after a reset) is "0" for all bits. To

change anything in the configuration register, a 16-bit digital word must be sent (CFG - 0

represents LSB, CFG -15 the MSB).

Table 8. Configuration register

Bit

Definition

R/W

Description

Default

CFG-0

Current gain

adjustment

R/W

6-bit DAC allows adjusting the device output current in 64

steps for each range (defined by CFG-6)

CFG-1

CFG-2

CFG-3

CFG-4

CFG-5

CFG-6

Current range

R/W

”0” low current range

“1” high current range

CFG-7

Error detection

mode

R/W

“0” normal mode

“1” reserved mode

CFG-8

Shorted-LED

detection

thresholds

R/W

Programmable output

shorted-LED detection

thresholds

CFG-9

CFG-8

Th. volt.

1.8 V

2.5 V

CFG-9

R/W

3 V

3.5 V

CFG-10

Auto OFF

shutdown

R/W

“0” device always ON

”1” auto power shutdown active (auto OFF)

CFG-11

Output turn-

on/off time

R/W

Programmable

output rise and fall

time (20% to 80%)

CFG-12 CFG-11 Turn-on

Turn-off

30 ns

20 ns

100 ns

40 ns

CFG-12

R/W

140 ns

80 ns

180 ns

150 ns

CFG-13

SDO delay

R/W

If “0” no delay is present on SDO

If “1” the data are shifted out and they are synchronized with

the falling edge of the CLK signal

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