RT9823 RICHTEK [Richtek Technology Corporation], RT9823 Datasheet - Page 2

• Manufacturer Part Number: RT9823
• Description: Smart Multi-Voltage Detector
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9823
Typical Application Circuit
Function Block Diagram
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2
Functional Pin Description
Pin No.
1
2
3
4
5
6
CTR
GND
MR
VADJ
V5
VCC
Pin Name
VADJ
VCC
V5
Manual Reset
3.3V or 5V
V
Reset Output (Open Drain, Active-Low) . When V
CTR will delay 300ms and become high. Once V5 or V
become low. When MR is high, CTR will become low.
Ground.
Manual Reset Input. Manual reset with internal pull high resister (1MΩ) , H : CTR = Low;
L : CTR signal is dependent on voltage detector output.
Voltage Detection Input. Connect 12V or other power with external resistive voltage
divider to this pin. The V
5V Voltage Detection Input. The detection threshold is 5V x 80%.
Supply Input. Connect this pin to standby power from system.
REF
12V
5V
Regulator
(V
Voltage
Voltage Detector
Voltage Detector
TH
R1
(V
= 5V x 80%)
TH
POR
= 1V)
R2
ADJ
6
4
3
5
VCC
VADJ
MR
V5
logic-high threshold voltage is 1V.
RT9823
Pin Function
GND
CTR
300ms
Delay
1
2
MR
CC
100k
Pull Up
> POR, V5 > 80%, and V
ADJ
VDD
RESET
µP
is < 80%, the signal will
DS9823-02 June 2011
CTR
GND
ADJ
> 1V,