X5083
To set the new VTRIP voltage, apply the desired VTRIP
threshold voltage 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 01h. CS going
HIGH on the write operation initiates the VTRIP programming
sequence. Bring WP LOW to complete the operation.
This procedure must be used to set the voltage to a lower
value.
To reset the new VTRIP voltage, apply the desired VTRIP
threshold voltage 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 01h.
Resetting the V
Voltage
TRIP
Note: This operation also writes 00h to array address 03h.
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
V
TRIP must be 4.0V, then the VTRIP must be reset. When
TRIP is reset, the new VTRIP is something less than 1.7V.
V
VP = 15-18V
WP
CS
0
1
2
3
4
5 6 7
0
1
2
3
4
5
6
7
8
9
10
20 21 22 23
SCK
16 Bits
SI
06h
02h
Write
00h
Data
0001h
Address
WREN
FIGURE 1. SET VTRIP LEVEL SEQUENCE (VCC = DESIRED VTRIP VALUE)
VP = 15-18V
WP
CS
0
1 2 3 4 5 6 7
0
1
2
3
4
5
6
7
8
9
10
20 21 22 23
SCK
SI
16 Bits
06h
WREN
02h
Write
00h
Data
0003h
Address
FIGURE 2. RESET VTRIP LEVEL SEQUENCE (VCC > 3V. WP = 15-18V)
FN8127.2
5
September 16, 2005
INTERSIL [ Intersil ]
