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POWER SUPPLY AND RESET SIGNAL OUTPUT TO THE TARGET SYSTEM
The S5U1C33001H includes the capability of supplying power and outputting a reset signal to the target system.
Pin No.
Pin name
1
Vcc (3.3 V)
2
Vcc (1.8 V)
3
Vss
4
TARGET_VCC
5
Vss
6
TARGET_RESET
The TARGET_VCC pin is used for the target power monitoring function. When this function is enabled, the S5U1C33001H
stops supplying power to the target system if the input voltage of the TARGET_VCC pin goes to 0 V.
The TARGET_RESET signal changes according to the RESET/WRITE switch operation.
When the RESET/WRITE switch is off: 3.3 V is output
When the RESET/WRITE switch is on: 0 V is output
When using the TARGET_RESET signal for resetting the target system, a reset circuit as shown in the figure below is
recommended.
The RESET/WRITE switch operation does not affect supplying power to the target system.
Note that the maximum current that can be supplied is 10 mA.
∗ The S5U1C33001H power supply circuit includes a PolySwitch (resettable fuse) that shuts down the power supply to the
target system when the output current exceeds 500 mA (it is automatically reset when the output current returns within the
range).
Table 10 Pin Assignment of the Target System Power Supply Connector
Target system power supply pin (3.3 V)
Target system power supply pin (1.8 V)
Target system power supply pin (GND)
Target system power supply monitor input pin
Target system power supply pin (GND)
Target system reset output pin
S5U1C33001H
TARGET_RESET
Figure 16 Example of Reset Circuit
S5U1C33001H
Function
Target system
3.3 V
S1C33xxx
Pull-up resistor
#RESET
Target
reset
circuit
Reset switch
(Ver. 4)
17
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