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ALED1642GW Datasheet(PDF) 21 Page - STMicroelectronics

Part # ALED1642GW
Description  16 channel LED driver with error detection, current gain control and 12/16-bit PWM brightness control for automotive applications
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ALED1642GW Datasheet(HTML) 21 Page - STMicroelectronics

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DocID025718 Rev 4
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ALED1642GW
Configuration register
39
The Table 9 shows an example of the current setting with an external resistance (REXT) = 11
K
Ω:
The Table 10 shows an example of current setting and gain control with REXT = 11 kΩ, see
also Figure 9.
The external programming resistance must be connected as close as possible to the related
device pins (REXT and GND) to reduce as minimum as possible the routing length and
prevent reference noise injection and electromagnetic interferences. Moreover, a direct
connection to the device GND pin reduces the possible output current variation when the
total device ground current changes (load effect).
Table 9. Example of current ranges
REXT [KΩ]
CFG-6
CFG-0 to CFG-5
LED current(1) [mA]
1.
The indicated values may be slightly different on the current device.
Accuracy
Low range
11
0
000000
3.1 mA
± 4% ch-to-ch
11
0
111111
12.5 mA
-
High range
11
1
000000
8.9 mA
11
1
011010
20 mA
± 3% ch-to-ch
Table 10. Gain steps for the current range selected by REXT = 11 kΩ
CFG-6
CFG(0 to 5)
LED current (1) [mA]
1.
The indicated values may be slightly different on the current device.
Low range
0
000000
3.131
0
000001
3.280
……
…
0
111111
12.524
High range
1
000000
8.945
1
000001
9.371
……
…
1
111111
35.782
21
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