X4005S8-1.8 datasheet(4/18 Pages) XICOR

Part #	X4005S8-1.8

Description	CPU Supervisor

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Manufacturer	XICOR [Xicor Inc.]

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4 / 18 page

X4003/X4005

Characteristics subject to change without notice.

4 of 18

REV 1.1.3 4/30/02

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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 write data 00hto

address 01h. The stop bit following a valid write operation

initiates the VTRIP programing sequence. Bring WP

LOW to complete the operation.

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 write 00h to

address 03h. The stop bit of a valid write operation ini-

tiates the VTRIP programming sequence. Bring WP

LOW to complete the operation.

Figure 2. Reset VTRIP Level Sequence (VCC > 3V. WP = 15-18V)

Figure 3. Sample VTRIP Reset Circuit

012 345 67

SCL

SDA

A0h

012 345 67

03h

WP

VP = 15-18V

012 345 67

00h

1

2

3

4

8

7

6

5

X4003/05

VTRIP

Adj.

VP

RESET/

4.7K

SDA

SCL

µC

Adjust

Run

RESET

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