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R5101G002A Datasheet

  • R5101G002A

  • Microprocessor power management with Watchdog Timer

  • 17頁

  • RICOH

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n
OUTLINE
鈥?9.12.3
Microprocessor power management with Watchdog Timer
R5101G Series
The R5101G Series are microprocessor power management ICs with high accuracy output voltage and
detector threshold and with ultra low supply current by CMOS process. Each of these ICs consists of a voltage
regulator, a voltage detector and a watchdog timer. Thus, the R5101G Series have the function of a power
management for microprocessor, a monitor of the voltage of a power source and a microprocessor supervisor.
The built-in voltage regulator with an internal driver transistor can supply typically 50mA current to a system
when the voltage difference between input and output is 2V. Therefore these ICs are very suitable for various
power supply systems for microprocessors. The output voltage is monitored by the voltage detector which is
built-in these ICs.
The built-in voltage detector has an output delay function and the delay time can be set by an external
capacitor(C
D
).
The output voltage and the detector threshold voltage can be set individually for each IC by laser trimming.
Furthermore, when a microprocessor works incorrectly, the watchdog timer which checks over microprocessor
generates reset signals intermittently to prevent a whole system from being malfunction.
The time period for watching and holding a reset signal of the watchdog timer can also be set individually
by an external capacitor(C
TW
).
n
FEATURES
l
Built-in a watchdog timer
l
Time period for monitoring and generating a reset signal of the watchdog timer can be set by an external
capacitor
l
Watchdog timer can be stopped individually by CE Pin
l
Low supply current
路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路 路TYP.
5碌A
l
The output voltage of Voltage Regulator and the detector threshold voltage can be set individually with a step
of 0.1V for each IC by laser trim
l
High Accuracy Output Voltage of Voltage Regulator and Detector Threshold
路 路 路 路
鹵2.5%
l
Power-on Reset Delay Time can be set by an external capacitor
l
Output Current
路 路 路 路 路 路 路
Typ. 50mA (at Vin - Vout = 2V)
l
Small Package
路 路 路
Ultra-mini SSOP-8G (0.65mm pitch ) Refer to Package Dimensions
n
APPLICATION
l
Power source for microprocessors
n
PIN CONFIGURATION
SSOP8G(0.65mm pitch)
SCK
C
D
C
TW
V
DD
Reset
CE
GND
V
OUT
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Rev. 1.10
-1-

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