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參數(shù)資料
| 型號： | X5168S8I-4.5A-T1 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大小： | 357K |
| 代理商： | X5168S8I-4.5A-T1 |
4
FN8130.1
September 16, 2005
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 VCC exceeds the device VTRIP 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 VCC level
and asserts RESET/RESET if supply voltage falls below a
preset minimum VTRIP. The RESET/RESET 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 VCC returns and exceeds VTRIP for 200ms.
VCC Threshold Reset Procedure
The X5168, X5169 has a standard VCC threshold (VTRIP)
voltage. This value will not change over normal operating
and storage conditions. However, in applications where the
standard VTRIP is not exactly right, or for higher precision in
the VTRIP value, the X5168, X5169 threshold may be
adjusted.
Setting the VTRIP Voltage
This procedure sets the VTRIP to a higher voltage value. For
example, if the current VTRIP is 4.4V and the new VTRIP 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 VTRIP voltage, apply the desired VTRIP
threshold to the VCC pin and tie the CS pin and the WP pin
HIGH. RESET/RESET and SO pins are left unconnected.
Then apply the programming voltage VP to both SCK and SI
and pulse CS LOW then HIGH. Remove VP and the
sequence is complete.
Resetting the VTRIP Voltage
This procedure sets the VTRIP to a “native” voltage level. For
example, if the current VTRIP is 4.4V and the VTRIP is reset,
the new VTRIP is something less than 1.7V. This procedure
must be used to set the voltage to a lower value.
To reset the VTRIP voltage, apply a voltage between 2.7 and
5.5V to the Vcc 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 VP to the SI pin ONLY
and pulse CS LOW then HIGH. Remove VP and the
sequence is complete.
SCK
SI
VP
CS
FIGURE 1. SET VTRIP VOLTAGE
SCK
SI
VCC
VP
CS
FIGURE 2. RESET VTRIP VOLTAGE
X5168, X5169
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