TLC5947: TLC5947

Ian Wang

Mastermind 25095 points

Part Number: TLC5947

Hi Sir,

Would you pls advise what different between XLAT and BLANK?

(BLANK=H output=0 ; PWM initial ; grayscale reset to 0)

Thanks, Ian.

over 5 years ago

0 Shawn Ding over 5 years ago

TI__Expert 3190 points

Hi Ian,
XLAT is used for communication, as the latch signal for the device, latching common shift register data to the device. Blank is a switch to turn-on or -off the output channels.

Regards,
Shawn.

0 Ian Wang over 5 years ago in reply to Shawn Ding

TI__Mastermind 25095 points

Hi Shawn,
Pls help for 3 pins application as below, thanks.
1. Blank 這應該是控制PWM on/off?
2. SOUT 應該是控制多顆driver串接用吧?只有一顆driver應該可以floating?
3. XLAT 這支腳不大了解,字面的理解好像也是控制輸出,有點類似會reset的動作,能解釋一下嗎??
Thanks, Ian.

0 Shawn Ding over 5 years ago in reply to Ian Wang

TI__Expert 3190 points

1, Blank 直接控制输出on/off
2, Yes, you are right
3, 这个功能可以理解为协议需要，协议要知道什么时候把common register 的数据复制下来供当前芯片使用，同时刷新芯片当前的寄存器

0 Ian Wang over 5 years ago in reply to Shawn Ding

TI__Mastermind 25095 points

Hi Shawn,
Thanks a lot.
再次確認一下
GPIO programing 為Mute的功能後,
該GPIO腳是input還是output呢?
從表格來看並沒有說mute是input or output,
但接線示意圖上面定義
我會解讀成open drain外部電壓給一個H準位,
當我某些條件下要做mute時,
由MCU控制該腳位拉L(對AMP來說為input)
這樣正確嗎?
Thanks, Ian.