參數(shù)資料
型號(hào)： bq2502
廠商： Benchmark Technology Group
英文描述： Integrated Backup Unit(完整的后備單元)
中文描述： 綜合備份單元（完整的后備單元）
文件頁(yè)數(shù)： 3/12頁(yè)
文件大?。?/td> 88K
代理商： BQ2502
As shipped from Benchmarq, the internal lithium cell is
electrically isolated from V
OUT
, CE
CON1
, and CE
CON2
.
Self-discharge in this condition is less than 0.5% per
year at 20°C.
Note:
Following the first application of V
CC
, this isola-
tion is broken, and the backup cell provides power to
V
OUT
, CE
CON1
, and CE
CON2
for theexternal SRAM.
This isolation can be reestablished by applying a valid
isolation signal to the bq2502. See Figure 2. This signal
requires CE low as V
CC
crosses both V
PFD
and V
SO
dur-
ing a power--down. Between these two points in time,
CE must be brought to (0.48 to 0.52)*V
CC
and held for
at least 700ns. The isolation signal is invalid if CE ex-
ceeds 0.54*V
CC
at any point between V
CC
crossing
V
PFD
and V
SO
.
The battery is connected to V
OUT
immediately on subse-
quent application and removal of V
CC
.
3
TD220201.eps
VCC
CE
VPFD
VSO
0.5 VCC
700ns
Figure 2. Battery Isolation Signal
Truth Table
Input
Output
CE
A
CE
CON1
CE
CON2
H
X
H
H
L
L
L
H
L
H
H
L
Apr. 1991
Caution:
Take care to avoid inadvertent discharge through
V
OUT
, CE
CON1
, and CE
CON2
after battery isolation
has been broken.
bq2502
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