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TPS3600D50 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS3600D50 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 26 page TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50 BATTERY BACKUP SUPERVISORS FOR LOW POWER PROCESSORS SLVS336B − DECEMBER 2000 − REVISED JANUARY 2007 6 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 MR 11 I Manual reset input MSWITCH 4 I Manual switch to force device into battery-backup mode (connect to GND if not used) PFI 7 I Power-fail comparator input (connect to GND if not used) 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 VOUT 1 O Supply output WDI 12 I Watchdog timer input detailed description battery freshness seal The battery freshness seal of the TPS3600 family disconnects the backup battery from the internal circuitry until it is needed. This ensures that the backup battery connected to VBAT should be fresh when the final product is put to use. The following steps explain how to enable the freshness seal mode: 1. Connect VBAT (VBAT > VBAT(min)) 2. Ground PFO 3. Connect PFI to VDD or PFI > V(PFI) 4. Connect VDD to power supply (VDD > VIT) 5. Ground MR 6. Power down VDD 7. The freshness seal mode is entered and pins PFO and MR can be disconnected. The battery freshness seal mode is disabled by the positive-going edge of RESET when VDD is applied. BATTOK output This 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 measure cycle on-time of 25 µs. This measurement cycle starts after the reset is released. If the battery voltage VBAT is below the negative-going threshold voltage V(BOK), the indicator BATTOK does a high-to-low transition. Otherwise, its status remains to the VOUT level. Table 1. Typical Values for BATTOK Indication SUPERVISOR TYPE VIT TYP VBOK MIN VBOK TYP VBOK MAX TPS3600D20 1.78 V 1.84 V 1.91 V 1.97 V TPS3600D25 2.22 V 2.3 V 2.38 V 2.46 V TPS3600D33 2.93 V 3.04 V 3.14 V 3.24 V TPS3600D50 4.40 V 4.56 V 4.71 V 4.86 V www.ti.com |
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