X5043 datasheet(4/20 Pages) XICOR

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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

06h

012 345 67 89 10

12 13 14 15

8 Bits

03h

02h

VPE = 15-18V

00h

WREN

Write

Address

Data

X5043

VTRIP

Adj.

RESET

4.7K

SCK

µC

Adjust

Run

X5045

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