Technical Note

10/17

BD8149MUV

www.rohm.com

2016.08 - Rev.B

© 2016 ROHM Co., Ltd. All rights reserved.

< Explanation of Auto-read trigger signal >

(1) In case auto-read starts by VDD power supply input

Auto-read will start after Power ON Reset clearance.

Gamma output voltage outputs a voltage matching the register setting synchronously after VCC voltage and REFIN

voltage input. (※)

The data reading time by auto-read is 3msec. Should maintain EN_AR=High during that time.

SETTING

・

SLAVE/AR = High

・

VDD input with the EN_AR pin is shorted to VDD pin

(2) In case auto-read starts by EN_AR

Auto-read will start with EN_AR=High.

Auto-read timing can be set optionally at the timing with EN_AR=High.

Gamma output voltage outputs a voltage matching a Register setting synchronously after VCC voltage and REFIN

voltage input

Data reading time by auto-read is 3msec. Should maintain EN_AR=High during that time.

SETTING

・

SLAVE/AR = High

・

EN_AR = Low ⇒ High

EN_AR

VDD

VCC

Gamma voltage is outputted

after VCC UVLO release (※)

OUT

Auto-read starts

with Power ON Reset clearance

Read completion

3 msec

Hi-z

EN_AR

VDD

VCC

Gamma voltage is outputted

after VCC UVLO release. (※)

OUT

Auto-read starts

with EN_AR=High

Read completion

3 msec

Hi-z

( ※ ) The case VCC is inputted

after read completion

(※) The case VCC is inputted

after read completion