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參數(shù)資料
| 型號： | X5328V14-2.7 |
| 元件分類： | EEPROM |
| 英文描述： | SPI Serial EEPROM with Supervisory Features |
| 中文描述： | SPI串行EEPROM，帶有監(jiān)控功能 |
| 文件頁數(shù)： | 3/21頁 |
| 文件大?。?/td> | 115K |
| 代理商： | X5328V14-2.7 |
X5328/X5329
Characteristics subject to change without notice.
3 of 21
REV 1.1.1 3/6/01
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X5328/X5329 activates a
Power On Reset Circuit. This circuit goes active at
about 1V and pulls the RESET/RESET pin active. This
signal prevents the system microprocessor from start-
ing to operate with insufficient voltage or prior to stabili-
zation of the oscillator. When V
V
TRIP
value for 200ms (nominal) the circuit releases
RESET/RESET, allowing the processor to begin exe-
cuting code.
CC
exceeds the device
Low Voltage Monitoring
During operation, the X5328/X5329 monitors the V
level and asserts RESET/RESET if supply voltage falls
below a preset minimum V
signal prevents the microprocessor from operating in a
power fail or brownout condition. The RESET/RESET
signal remains active until the voltage drops below 1V.
It also remains active until V
V
TRIP
for 200ms.
CC
TRIP
. The RESET/RESET
CC
returns and exceeds
V
The X5328/X5329 has a standard V
(V
TRIP
) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard V
for higher precision in the V
X5329 threshold may be adjusted.
CC
Threshold Reset Procedure
CC
threshold
TRIP
is not exactly right, or
value, the X5328/
TRIP
Setting the V
This procedure sets the V
value. For example, if the current V
new V
TRIP
is 4.6V, this procedure directly makes the
change. If the new setting is lower than the current set-
ting, then it is necessary to reset the trip point before
setting the new value.
TRIP
Voltage
TRIP
to a higher voltage
is 4.4V and the
TRIP
To set the new V
threshold to the V
pin HIGH. RESET/RESET and SO pins are left uncon-
nected. Then apply the programming voltage V
both SCK and SI and pulse CS LOW then HIGH.
Remove V
P
and the sequence is complete.
TRIP
CC
voltage, apply the desired V
pin and tie the CS pin and the WP
TRIP
P
to
Figure 1. Set V
TRIP
Voltage
Resetting the V
This procedure sets the V
level. For example, if the current V
V
TRIP
is reset, the new V
1.7V. This procedure must be used to set the voltage to
a lower value.
TRIP
Voltage
TRIP
to a “native” voltage
is 4.4V and the
is something less than
TRIP
TRIP
To reset the V
and 5.5V to the V
and the SCK pin HIGH. RESET/RESET and SO pins
are left unconnected. Then apply the programming volt-
age V
P
to the SI pin ONLY and pulse CS LOW then
HIGH. Remove V
P
and the sequence is complete.
TRIP
voltage, apply a voltage between 2.7
pin. Tie the CS pin, the WP pin,
CC
Figure 2. Reset V
TRIP
Voltage
SCK
SI
V
P
V
P
CS
SCK
SI
V
CC
V
P
CS
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