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3.3 Power-ON Threshold Voltage Settings
The threshold voltage used to judge whether the target system is connected (hereafter called "power-ON
threshold voltage") is set to 1.7 V at shipment. (Refer to Figure 3-1 JP4 Settings at Shipment.) To change this
threshold voltage, insert a 4-pin jumper (standard accessory) on which resistors have been mounted to JP4 as
shown in Figure 3-2. For the location of JP4, refer to Figure 2-1.
CHAPTER 3 SWITCH SETTINGS
Figure 3-1. JP4 Settings at Shipment
3.9 k
JP4
5 V
V
from target system
DD
Figure 3-2. Changing Power-ON Threshold Voltage
R1
R2
1
2
3
1
2
3
The threshold voltage can be obtained with the following equation.
Threshold voltage = 5 V × R2/(R1 + R2)
User's Manual U16594EJ1V0UM
Ω
Ω
2 k
1
2 3 4
(1.7 V)
Voltage comparator
Split resistor
4-pin jumper
4
(standard accessory)
4
JP4
21
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