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BQ2201SN-N Datasheet(PDF) 2 Page - Texas Instruments

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Part # BQ2201SN-N
Description  SRAM Nonvolatile Controller Unit
Download  15 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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As the supply continues to fall past VPFD, an internal
switching device forces VOUT to one of the two external
backup energy sources. CECON is held high by the VOUT
energy source.
During power-up, VOUT is switched back to the VCC sup-
ply as VCC rises above the backup cell input voltage
sourcing VOUT. The CECON output is held inactive for
time tCER (120 ms maximum) after the supply has
reached VPFD, independent of the CE input, to allow for
processor stabilization.
During power-valid operation, the CE input is fed
through to the CECON output with a propagation delay
of less than 10ns. Nonvolatility is achieved by hardware
hookup, as shown in Figure 1.
Energy Cell Inputs—BC1,BC2
Two primary backup energy source inputs are provided
on the bq2201. The BC1 and BC2 inputs accept a 3V pri-
mary battery, typically some type of lithium chemistry.
If no primary cell is to be used on either BC1 or BC2, the
unused input should be tied to VSS.
If both inputs are used, during power failure the VOUT
output is fed only by BC1 as long as it is greater than
2.5V. If the voltage at BC1 falls below 2.5V, an internal
isolation switch automatically switches VOUT from BC1
to BC2.
To prevent battery drain when there is no valid data to
retain, VOUT and CECON are internally isolated from
BC1 and BC2 by either of the following:
s
Initial connection of a battery to BC1 or BC2,or
s
Presentation of an isolation signal on CE.
A valid isolation signal requires CE low as VCC crosses
both VPFD and VSO during a power-down. See Figure 2.
Between these two points in time, CE must be brought
to the point of (0.48 to 0.52)*VCC and held for at least
700ns.
The isolation signal is invalid if CE exceeds
0.54*VCC at any point between VCC crossing VPFD and
VSO.
The appropriate battery is connected to VOUT and CECON
immediately on subsequent application and removal of VCC.
2
FG220101.eps
VCC
CE
BC1
THS
VSS
VOUT
CECON
BC2
bq2201
VCC
CE
CMOS
SRAM
5V
From Address Decoder
3V
Primary
Cell
3V
Primary
Cell
Figure 1. Hardware Hookup (5% Supply Operation)
Oct. 1998 D
TD220101.eps
VCC
CE
VPFD
VSO
0.5 VCC
700ns
Figure 2. Battery Isolation Signal
bq2201


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