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M62021L Datasheet(PDF) 5 Page - Renesas Technology Corp |
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M62021L Datasheet(HTML) 5 Page - Renesas Technology Corp |
5 / 14 page M62021L/P/FP REJ03D0784-0200 Rev.2.00 Jun 15, 2007 Page 5 of 13 Pin Description Pin No. Pin Name Symbol Function 1 Power supply output VOUT VIN and VBAT are controlled by means of an internal switch and output through VOUT. The pin is capable of outputting up to 100 mA. Use it as VDD of CMOS RAM and the like. 2 Backup power supply input VBAT Backup power supply is connected to this pin. If a lithium battery is used, insert a resistor in series for safety purposes. 3 Power supply input VIN +5 V input pin. Connect to a logic power supply. 4 Delay capacitor connection pin Ct A delay capacitor is connected to this pin. By connecting a capacitor, it is possible to delay each output. 5 Positive reset output RES Connect to the positive reset input of a microcomputer. The pin is capable of flowing 1 mA sink current. 6 Ground GND Reference for all signals. 7 Negative reset output RES Connect to the negative reset input of a microcomputer. The pin is capable of flowing 1 mA sink current. 8 Chip select output CS Connect to the chip select of RAM. The CS output is at low level in normal state thereby letting RAM be active. Under failure or backup condition, the CS output is set to high level, then RAM enters standby state disabling read/write function. The pin is capable of flowing a 1 mA sink current. Application Example 3 1 R1 VIN 7 RES 5 RES VOUT 2 VBAT COUT 4 Ct 8 CS R2 D1 – + 1.24V +5V (Main power supply) Com SW M62021 Reset circuit Delay circuit 6 GND Battery 3V + + CIN + C1 Note)1 Notes: * 1. 2. Capacitance to be connected: CIN: 10µF, COUT: 4.7µF, Ct: 4.7µF If connecting a zener diode, select one of VZ ≈ 2V to 3V. (IZ = 0.1mA) When it is necessary to charge the back-up power supply such as using the large-capacity capacitor, connect it to VIN via a diode and a protection resistor. + Note)2 VDD VDD MCU or CPU CMOS RAM Figure 2 Application Example |
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