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MB3790 Datasheet(PDF) 4 Page - Fujitsu Component Limited. |
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MB3790 Datasheet(HTML) 4 Page - Fujitsu Component Limited. |
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4 / 21 page  4 MB3790 s PIN DESCRIPTION Pin number Symbol I/O Name and function 16P 20P 1 1 N.C. — Non connection 22 VBATI I This pin connects to the primary battery. 3, 4 3, 4 VOUT O These pins supply the output voltage. (Range of output current value IOUT ≤ 200 mA) 55 VBAT2 I/O This pin connects to the secondary battery. When the power supply voltage is greater than or equal to the detection level (i.e., VINH), the secondary battery is recharged using the constant-voltage method of charging. — 6, 7 N.C. — Non connection 6 8 ALARM1 O This is an open-collector output pin for a primary battery alarm signal. When the power supply voltage is greater than or equal to VINH, it monitors the primary battery voltage. If the power supply voltage is less than VINL, it does not monitor the primary battery voltage. If VBAT1 is less than or equal to 2.65 V, its output voltage is forced to a Low level. 7 9 ALARM2 O This is an open-collector output pin for a primary battery alarm signal. When the power supply voltage is greater than or equal to VINH, it monitors the primary battery voltage. If the power supply voltage is less than VINL, it does not monitor the primary battery voltage. If VBAT1 is less than or equal to 2.37 V, its output voltage is forced to a Low level. 8 10 GND — This pin connects to the ground (0 V). 9 11 RESET O This pin outputs a reset signal. When the power supply voltage is less than or equal to VINL, it outputs a High level. If the power supply voltage of SRAM is less than the designated range, it directly controls the CE or CS of SRAM to disable writes and thereby protect the data in memory. 10 12 RESET O This pin outputs an inverted signal of RESET. 11 13 CT — This pin is used to set the reset pulse width. Insert a capacitor between this pin and GND to set the pulse width. — 14, 15 N.C. — Non connection 12 16 VSENSE I This pin accepts comparator input for detecting the power supply voltage level. For details, refer to APPLICATION in this data sheet. 13, 14 17, 18 VIN I These pins accept the input voltage for the device. 15 19 N.C. — Non connection 16 20 CONTROL I This pin is used for output control. For details, refer to APPLICATION in this data sheet. |
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