RT9824 RICHTEK [Richtek Technology Corporation], RT9824 Datasheet - Page 2

• Manufacturer Part Number: RT9824
• Description: Smart Multi-Voltage Detector
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9824
Typical Application Circuit
Function Block Diagram
www.richtek.com
2
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
CTR
RESET
GND
MR
VADJ
V5
V54
VCC
Pin Name
VADJ
VCC
V54
V5
Manual Reset
3.3V or 5V
Control Output (Open Drain, Active-Low). Only when V
> 80%, and V
or V
RESET Output (Open Drain, Active-Low). Only when V
> 80%, and V
V54 or V
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 resister divider to this
pin. The V
5V Voltage Detection Input. The detection threshold is 5V x 80%.
54V Voltage Detection Input. The detection threshold is 5.4V x 80%.
Connect this Pin to Standby Power from system.
V
REF
5.4V
12V
5V
ADJ
is <80%, the signal will become low. When MR is high, CTR will become low.
Regulator
(V
ADJ
(V
Voltage
R1
Voltage Detector
Voltage Detector
Voltage Detector
TH
ADJ
TH
(V
= 5.4V x 80%)
is < 80%, the signal will become low.
= 5V x 80%)
TH
ADJ
ADJ
POR
logic-high threshold voltage is 1V.
= 1V)
R2
is > 1V, the CTR will delay 300ms and become high. Once V5 or V54
is > 1V, the RESET will delay 300ms and become high. Once V5 or
8
5
4
6
7
VCC
VADJ
MR
V5
V54
RT9824
RESET
GND
CTR
Pin Function
300ms
Delay
1
2
3
MR
100k
Pull Up
100k
Pull Up
VDD
CC
VDD
RESET
CC
CTR
µP
µP
is > POR, V5 is > 80%, V54 is
is > POR, V5 is > 80%, V54 is
RESET
CTR
GND
DS9824-01 April 2011