CHAPTER 3 SWITCH SETTINGS
User’s Manual U16594EJ1V0UM
21
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.
Figure 3-1. JP4 Settings at Shipment
Figure 3-2. Changing Power-ON Threshold Voltage
The threshold voltage can be obtained with the following equation.
Threshold voltage = 5 V
×
R2/(R1 + R2)
JP4
3.9 k
Ω
1 2 3 4
2 k
Ω
5 V
Voltage comparator
V
DD
from target system
(1.7 V)
JP4
1
2
3
4
4-pin jumper
(standard accessory)
Split resistor
1
2
3
4
R1
R2
Содержание IE-703217-G1-EM1
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