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TPS3610T50PWR Datasheet(PDF) 6 Page - Texas Instruments

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Part # TPS3610T50PWR
Description  BATTERY-BACKUP SUPERVISORS FOR RAM RETENTION
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS3610T50PWR Datasheet(HTML) 6 Page - Texas Instruments

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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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