X5083 Datasheet, PDF (5/20 Pages) Xicor Inc. – CPU Supervisor with 8Kbit SPI EEPROM

X5083
To set the new V_TRIP voltage, apply the desired V_TRIP
threshold voltage to the V_CC pin and tie the WP pin to the
programming voltage V_P. Then send a WREN command,
followed by a write of Data 00h to address 01h. CS going
HIGH on the write operation initiates the V_TRIP programming
sequence. Bring WP LOW to complete the operation.
Note: This operation also writes 00h to array address 01h.
Resetting the V_TRIP Voltage
This procedure is used to set the V_TRIP to a “native” voltage
level. For example, if the current V_TRIP is 4.4V and the new
V_TRIP must be 4.0V, then the V_TRIP must be reset. When
V_TRIP is reset, the new V_TRIP is something less than 1.7V.
This procedure must be used to set the voltage to a lower
value.
To reset the new V_TRIP voltage, apply the desired V_TRIP
threshold voltage to the Vcc pin and tie the WP pin to the
programming voltage V_P. Then send a WREN command,
followed by a write of data 00h to address 03h. CS going
HIGH on the write operation initiates the V_TRIP programming
sequence. Bring WP LOW to complete the operation.
Note: This operation also writes 00h to array address 03h.
WP
V_P = 15-18V
CS
SCK
SI
0 1 23 4 56 7
0 1 2 3 4 5 6 7 8 9 10 20 21 22 23
16 Bits
06h
WREN
02h
Write
0001h
Address
FIGURE 1. SET V_TRIP LEVEL SEQUENCE (V_CC = DESIRED V_TRIP VALUE)
00h
Data
WP
V_P = 15-18V
CS
SCK
SI
0 1 23 4 56 7
0 1 2 3 4 5 6 7 8 9 10 20 21 22 23
16 Bits
06h
WREN
02h
Write
0003h
Address
FIGURE 2. RESET V_TRIP LEVEL SEQUENCE (V_CC > 3V. WP = 15-18V)
00h
Data
5
FN8127.2
September 16, 2005