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M62002FP Datasheet(PDF) 5 Page - Mitsubishi Electric Semiconductor |
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M62002FP Datasheet(HTML) 5 Page - Mitsubishi Electric Semiconductor |
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5 / 6 page  ( / 6 ) ELECTRIC MITSUBISHI M62001L,FP/M62002L,FP/M62003L,FP/M62004L,FP/ M62005L,FP/M62006L,FP/M62007L,FP/M62008L,FP MITSUBISHI<Dig.Ana.INTERFACE> LOW POWER 2 OUTPUT SYSTEM RESET IC SERIES 5 OPERATION PRINCIPLE DESCRIPTION In general,the memory backup function of a microcomputer,as shown in figure,uses two diodes to switch between main power supply and backup power supply.The M62001~M62008 are ICs that,in such memory backup operation,monitor in 2 steps each voltage on the VDD line. VDD INT RESET INT RESET MAIN POWER SUPPLY BACKUP POWER SUPPLY M62001 Vcc MICROCOMPUTER SYSTEM The ICs have an intelligent sequence such as substantial hysteresis action of RESET toward normal state at restoration of supply voltage,as well as 2-step detection in low power dissipation mode. OPERATION IN DETAIL 1.Two Step Detection The ICs perform 2-step detection of supply voltage and have 2 output pins (INT and RESET).Although they have 2 comparators for 2-step detection,they differ significantly from such that are simply provided with independent detectors,because the RESET output signal is dependent at power-up and the like upon the INT output signal. 2.INT output (Detection of 4.45V and 4.25V) The INT output at the power-up of supply voltage detects VSH (4.45V/4.25V)to inform the microcomputer system of the fact that the supply voltage has reached its normal level.When the supply voltage drops from its normal level to VSL(4.45V/4.25V)an interruption signal is output to alter the microcomputer system into RAM backup mode. The microcomputer at this point enters sleep state and secures memory by a stop command issued by the interruption signal.These detection voltage ,VSH the rise,and VSL the fall,of supply voltage,have a 100-mV hysteresis voltage between themselves. VSH-VSL=100(mV) . . INT OUTPUT VOLTAGE VS. SUPPLY VOLTAGE SUPPLY VOLTAGE Vcc(V) 0 1 2 3 4 5 4.0 4.2 4.4 4.6 4.8 5.0 VSL VSH 3.RESET Output (Detection of 2.15V) The RESET outputs a signal to prevent the microcomputer from malfunctioning due to a drop in supply voltage. When powering up,RESET is kept at low level until the supply voltage reaches VSH.If the supply voltage rises to VSH,RESET is set to high level.By inserting a capacitor between the Cd pin and GND,it is possible to produce a desired delay time (td).To set a delay time,equation below is used. td=1.52X10 XCd(sec) . . 5 Once the supply voltage has exceeded VSH and the RESET output is set to high level,RESET maintains the high level until the supply voltage drops to VBATT.When the supply voltage drops to VBATT,RESET goes low thereby resetting and initializing the microcomputer. The RESET output has a large hysteresis voltage of approximately 2V between the rise in supply voltage at power- up and its fall. 0 1 2 3 4 5 2 3 4 5 VSH VBATT SUPPLY VOLTAGE Vcc RESET OUTPUT VOLTAGE VS. SUPPLY VOLTAGE |
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