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AS3695C Datasheet(PDF) 23 Page - ams AG

No. de pieza AS3695C
Descripción Electrónicos  16 channel white LED controller for LCD backlight
PDF  40 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

AS3695C Datasheet(HTML) 23 Page - ams AG

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AS3695C
austriamicrosystems
www.austriamicrosystems.com
Rev 1.11 / 2010-12-08
22 - 39
4.3
Power supply
4.4
Safety features
4.4.1 Temperature shutdown
If OTturnoff = 1 the outputs of the device are turned off when the die temperature reaches 140°C. If the
die temperature goes below 130°C the outputs are turned on again.
4.4.2 xRES input
In addition to the build in power on reset circuit there is an external reset input “xRES” available. This
gives the possibility to keep the outputs turned off until all blocks of the LED-driver circuits are fully
working ( DCDC, MCU ... )
4.4.3 Register Lock/Unlock
To prevent wrong writing to registers due to noise on the serial interface a lock/unlock mechanism is
implemented.
Register 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x13 , 0x61, 0x62, 0x63 belong to Group1
and can only be written if Group1 is unlocked by the “LOCKUNLOCK”-byte (Reg: 0x36 )
Register 0x0D, 0x0E, 0x11, 0x12, 0x14, 0x15 belong to Group2 and can only be written if Group2 is
unlocked by the “LOCKUNLOCK”-byte (Reg: 0x36 )
The default value of the Groups is locked.
4.5
Reference circuit
The reference circuit generates an internal supply voltage of 2.5V for the digital logic.
RegAddr: 0x58
STATUS
Bit
Name
Description
Default
Acc
ess
7
STATnosync
Sync detector status
0...no sync fault
1...sync fault. VSYNC was missed for > 100ms
0
r
6
STATOT
Overtermperature status
0...no overtemperature
1...overtemperature
0
r
5
STATopen
Status open LED detection
0...no open LED detected
1...opdn LED detected
0
r
4
STATshort
Status short LED detection
0...no short LED detected
1...short LED detected
0
r
3
Not used
0
VDD
LDO
2.5V digital supply
V2_5
AGND
4.0V to 5.5V analog supply
POR
Temp
xRES
Toff_OverT



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