LED7708 STMicroelectronics, LED7708 Datasheet - Page 42

• Manufacturer Part Number: LED7708
• Description: LED Lighting Drivers 16 Ch 85mA LED 3.6 to 36V 250kHz
• Manufacturer: STMicroelectronics

Specifications of LED7708

• Rohs: yes

Recommended operating conditions
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Grayscale synchronization
Grayscale sync (GSSY) used as synchronization output
When the DSYS bit of the DEVCFG1 register is set low, the GSSY pin of the LED7708 is set
as output. A 4xT
dimming cycle (latency followed by a dimming period).
Figure 15. Dimming waveform and GSSY output pulse
Grayscale sync (GSSY) used as synchronization input
When the DSYS bit of the DEVCFG1 register is set high, the GSSY pin of the LED7708 is
set as input. This option can be used to lock the dimming cycles (latency followed by a
dimming period) to the vertical sync signal (VSYNC) coming from the video processor. The
minimum pulse duration is 2xT
dimming sequence is stopped and the grayscale counter is reset. A new dimming sequence
is triggered when the GSSY pin goes low.
Figure 16. Dimming waveform triggered by GSSY input
GSC
high level pulse is provided at the GSSY pin at the end of each
Doc ID 022698 Rev 1
GSC
. As soon as the GSSY signal goes high, the ongoing
LED7708