X5083P datasheet(4/21 Pages) XICOR

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X5083

Characteristics subject to change without notice.

4 of 21

REV 1.1.6 6/25/02

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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 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 com-

plete 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

06h

012 345 67 89 10

20 21 22 23

16 Bits

0003h

02h

VP = 15-18V

00h

WREN

Write

Address

Data

X5083

VTRIP

Adj.

RESET

4.7K

SCK

µC

Adjust

Run

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