Microprocessor power management with
Watchdog Timer
R5101G SERIES
NO. EA-071-071025
1
OUTLINE
The R5101G Series are CMOS-based con power management ICs with high accuracy output voltage and
detector threshold and with ultra low supply current. 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 (CD).
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 timeout periods for watchdog and reset can also be set individually by an external capacitor (CTW).
FEATURES
Built-in a watchdog timer
Timeout period for watchdog and generating a reset signal can be set by an external capacitor
Watchdog timer can be stopped individually by CE Pin
Low supply current Typ. 5A
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.
High Accuracy Output Voltage of Voltage Regulator and Detector Threshold ±2.5%
Power-on Reset Delay Time can be set by an external capacitor
Output Current Typ. 50mA (at VIN - VOUT=2V)
Small Package Ultra-mini SSOP-8G (0.65mm pitch)
APPLICATION
Power source for microprocessors