X1228 datasheet(17/31 Pages) XICOR

17 / 31 page

X1228

REV 1.3 3/24/04

Characteristics subject to change without notice.

17 of 31

www.xicor.com

Figure 5. Set VTRIP Level Sequence (VCC = desired VTRIP value)

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 more than 5.5V

to the VCC pin and tie the RESET pin to the

programming voltage VP. Then write 00h to address

03h. The stop bit of a valid write operation initiates the

VTRIP programming sequence. Bring RESET to VCC to

complete the operation. Note: this operation takes up

to 10 milliseconds to complete and also writes 00h to

address 03h of the EEPROM array.

For best accuracy in setting VTRIP, it is advised that the

following sequence be used.

1.Program VTRIP as above.

2.Measure resulting VTRIP by measuring the VCC

value where a RESET occurs. Calculate Delta =

(Desired – Measured) VTRIP value.

3.Perform a VTRIP program using the following formula

to set the voltage of the RESET pin:

VRESET = (Desired Value – Delta) + 0.025V

Figure 6. Reset VTRIP Level Sequence

SCL

SDA

01h

RESET

VP = 15V

00h

012 345 67

01 2 345 67

01 2 3 4 5 6 7

01 2 3 45 67

AEh

00h

VCC

Note: BP0, BP1, BP2 must be disabled.

012 345 67

SCL

SDA

AEh

01 2 345 67

03h

RESET

VP = 15V

00h

01 2 345 67

00h

VCC

Note: BP0, BP1, BP2 must be disabled.

X1228 Datasheet(PDF) 17 Page - Xicor Inc.

X1228 Datasheet(HTML) 17 Page - Xicor Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Datasheet Download

Link URL