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X5045PI-2.7A Datasheet(PDF) 4 Page - Xicor Inc.

Part # X5045PI-2.7A
Description  CPU Supervisor with 4K SPI EEPROM
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X5045PI-2.7A Datasheet(HTML) 4 Page - Xicor Inc.

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X5043/X5045
Characteristics subject to change without notice.
4 of 20
REV 1.1.2 5/29/01
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Resetting the VTRIP Voltage
This procedure is used to set the VTRIP to a “native”
voltage level. For example, if the current VTRIP is 4.4V
and the new VTRIP must be 4.0V, then the VTRIP must
be reset. When VTRIP is reset, the new VTRIP is some-
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
To reset the VTRIP voltage, apply at least 3V to the VCC
pin and tie the WP pin to the programming voltage VP.
Then send a WREN command, followed by a write of
Data 00h to address 03h. CS going HIGH on the write
operation initiates the VTRIP programming sequence.
Bring WP LOW to complete the operation.
Note: This operation also writes 00h to array address
03h.
Figure 2. Reset VTRIP Level Sequence (VCC > 3V. WP = 15–18V)
Figure 3. Sample VTRIP Reset Circuit
012 345 67
SCK
SI
CS
06h
012 345 67 89 10
12 13 14 15
8 Bits
03h
02h
WP
VPE = 15-18V
00h
WREN
Write
Address
Data
11
1
2
3
4
8
7
6
5
X5043
VTRIP
Adj.
VP
RESET
4.7K
SI
SO
CS
SCK
µC
Adjust
Run
X5045


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