参数资料
| 型号： | X5168PI-2.7 |
| 厂商： | Intersil |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR CPU 16K EE 8-DIP |
| 标准包装： | 50 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 100 ms |
| 电压 - 阀值： | 2.63V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
X5168, X5169
Principles of Operation
Power-on Reset
Application of power to the X5168, X5169 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.
When V CC exceeds the device V TRIP value for 200ms
(nominal) the circuit releases RESET/RESET, allowing the
processor to begin executing code.
Low Voltage Monitoring
During operation, the X5168, X5169 monitors the V CC level
and asserts RESET/RESET if supply voltage falls below a
preset minimum V TRIP . The RESET/RESET signal prevents
Resetting the V TRIP Voltage
This procedure sets the V TRIP to a “native” voltage level. For
example, if the current V TRIP is 4.4V and the V TRIP is reset,
the new V TRIP is something less than 1.7V. This procedure
must be used to set the voltage to a lower value.
To reset the V TRIP voltage, apply a voltage between 2.7 and
5.5V to the V CC pin. Tie the CS pin, the WP pin, and the SCK
pin HIGH. RESET/RESET and SO pins are left unconnected.
Then apply the programming voltage V P to the SI pin ONLY
and pulse CS LOW then HIGH. Remove V P and the
sequence is complete.
CS
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
SCK
V CC
until V CC returns and exceeds V TRIP for 200ms.
V CC Threshold Reset Procedure
The X5168, X5169 has a standard V CC threshold (V TRIP )
voltage. This value will not change over normal operating
and storage conditions. However, in applications where the
standard V TRIP is not exactly right, or for higher precision in
the V TRIP value, the X5168, X5169 threshold may be
adjusted.
Setting the V TRIP Voltage
This procedure sets the V TRIP to a higher voltage value. For
example, if the current V TRIP is 4.4V and the new V TRIP is
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.
To set the new V TRIP voltage, apply the desired V TRIP
threshold to the V CC pin and tie the CS pin and the WP pin
HIGH. RESET/RESET and SO pins are left unconnected.
Then apply the programming voltage V P to both SCK and SI
and pulse CS LOW then HIGH. Remove V P and the
sequence is complete.
CS
V P
SCK
V P
SI
FIGURE 1. SET V TRIP VOLTAGE
5
SI
V P
FIGURE 2. RESET V TRIP VOLTAGE
FN8130.2
June 15, 2006
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