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TPS3610T50PWR Datasheet(PDF) 6 Page - Texas Instruments |
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TPS3610T50PWR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 26 page TPS3610U18, TPS3610T50 BATTERY BACKUP SUPERVISORS FOR RAM RETENTION SLVS327B – DECEMBER 2000 – REVISED DECEMBER 2002 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION BATTOK 9 O Battery status output BATTON 6 O Logic output/external bypass switch driver output CEIN 5 I Chip-enable input CEOUT 10 O Chip-enable output GND 3 I Ground LOWLINE 11 O Early power-fail warning output MSWITCH 4 I Manual switch to force device into battery-backup mode VOUT 1 O Supply output PFI 7 I Power-fail comparator input PFO 8 O Power-fail comparator output RESET 13 O Active-low reset output VBAT 14 I Backup-battery input VDD 2 I Input supply voltage WDI 12 I Watchdog timer input detailed description battery freshness seal The battery freshness seal of the TPS3610 family disconnects the backup battery from internal circuitry until it is needed. This function ensures that the backup battery connected to VBAT is fresh when the final product is put to use. The following steps explain how to enable the freshness seal mode: 1. Connect VBAT (VBAT > VBATmin) 2. Ground PFO 3. Connect PFI to VDD (PFI = VDD) 4. Connect VDD to power supply (VDD > VIT) and keep connected for 5 ms < t < 35 ms The battery freshness seal mode is disabled by the positive-going edge of RESET when VDD is applied. BATTOK output BATTOK is a logic feedback of the device to indicate the status of the backup battery. The supervisor checks the battery voltage every 200 ms with a voltage divider load of approximately 100 k Ω and a measurement cycle on-time of 25 µs. The measurement cycle starts after the reset is released. If the battery voltage VBAT is below the negative-going threshold voltage VIT(BOK), the indicator BATTOK does a high-to-low transition. Otherwise it retains its status to VDD level. 25 µs IBAT 200 ms 100 µA t Figure 1. BATTOK Timing |
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