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LED1642GWXTTR データシート(PDF) 20 Page - STMicroelectronics

部品番号 LED1642GWXTTR
部品情報  16 channel LED driver with error detection current gain control
PDF  42 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED1642GWXTTR データシート(HTML) 20 Page - STMicroelectronics

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Configuration register
LED1642GW
20/42
DocID024395 Rev 6
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 10.
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
35.78
21
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