X5323S8Z-4.5A Intersil, X5323S8Z-4.5A Datasheet - Page 5

• Manufacturer Part Number: X5323S8Z-4.5A
• Description: IC CPU SUPERV 32K EE 8-SOIC
• Manufacturer: Intersil
• Type: Simple Reset/Power-On Resetr

Specifications of X5323S8Z-4.5A

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 100 ms Minimum
• Voltage - Threshold: 4.63V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Principles of Operation
Power-on Reset
Application of power to the X5323/X5325 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 starting to operate with
insufficient voltage or prior to stabilization of the oscillator. As
long as RESET/RESET pin is active, the device will not
respond to any Read/Write instruction. When V
the device V
releases RESET/RESET, allowing the processor to begin
executing code.
Low Voltage Monitoring
During operation, the X5323/X5325 monitors the V
and asserts RESET/RESET if supply voltage falls below a
preset minimum V
the microprocessor from operating in a power fail or
brown-out condition. The RESET/RESET signal remains
active until the voltage drops below 1V. It also remains active
until V
Watchdog Timer
The watchdog timer circuit monitors the microprocessor
activity by monitoring the WDI input. The microprocessor must
toggle the CS/WDI pin periodically to prevent a
RESET/RESET signal. The CS/WDI pin must be toggled
from HIGH to LOW prior to the expiration of the watchdog
time out period. The state of two nonvolatile control bits in
the status register determine the watchdog timer period. The
microprocessor can change these watchdog bits, or they
may be “locked” by tying the WP pin LOW and setting the
WPEN bit HIGH.
V
The X5323/X5325 has a standard V
voltage. This value will not change over normal operating
and storage conditions. However, in applications where the
standard V
the V
adjusted.
Setting the V
This procedure sets the V
example, if the current V
4.6V, this procedure directly makes the change. If the new
setting is lower than the current setting, then it is necessary
to reset the trip point before setting the new value.
CC
Threshold Reset Procedure
TRIP
CC
returns and exceeds V
value, the X5323/X5325 threshold may be
TRIP
TRIP
TRIP
is not exactly right, or for higher precision in
value for 200ms (nominal) the circuit
TRIP
Voltage
. The RESET/RESET signal prevents
TRIP
TRIP
is 4.4V and the new V
5
to a higher voltage value. For
TRIP
CC
for 200ms.
threshold (V
CC
exceeds
CC
TRIP
TRIP
level
X5323, X5325
)
is
To set the new V
threshold to the VCC pin and tie the CS/WDI pin and the WP
pin HIGH. RESET/RESET and SO pins are left
unconnected. Then apply the programming voltage V
both SCK and SI and pulse CS/WDI LOW then HIGH.
Remove V
Resetting the V
This procedure sets the V
example, if the current V
the new V
must be used to set the voltage to a lower value.
To reset the V
and 5.5V to the VCC pin. Tie the CS/WDI pin, the WP pin,
and the SCK pin HIGH. RESET/RESET and SO pins are left
unconnected. Then apply the programming voltage V
SI pin ONLY and pulse CS/WDI LOW then HIGH. Remove
V
P
and the sequence is complete.
SCK
SCK
SI
CS
SI
CS
TRIP
P
and the sequence is complete.
TRIP
FIGURE 2. RESET V
V
is something less than 1.7V. This procedure
V
V
V
FIGURE 1. SET V
P
CC
P
P
TRIP
TRIP
voltage, apply a voltage between 2.7V
voltage, apply the desired V
Voltage
TRIP
TRIP
is 4.4V and the V
to a “native” voltage level. For
TRIP
TRIP
VOLTAGE
VOLTAGE
TRIP
TRIP
June 30, 2008
is reset,
P
P
FN8131.2
to the
to