CHAPTER 3 HARDWARE SETTINGS AND FUNCTIONS
User’s Manual U17029EJ3V0UM
21
3.2.1 QB-78K0MINI equivalent circuit
Figure 3-1. Equivalent Circuit
•
Supervisor side
•
QB78K0MINI side
X1
FLMD0
1 k
Ω
PULL UP
3.3 V
5 V
100 k
Ω
PULL UP
1 M
Ω
1 k
Ω
3.3 k
Ω
Jumper
F
XX
3-state output
Clock measurement by timer IN function
Clock measurement by timer OUT function
Clock output switch
14-pin oscillator or oscillation circuit (C, R, X'TAL)
RESET_OUT
RESET_IN
V
DD
_IN
X2
5 V
74VHC125
Note
74LV07
GND
74VHC125
Note
74VHC125
Note
74VHC125
Note
74VHC125
Note
74LV07
Note
The target output buffer’s power supply is provided via the target system’s V
DD
pin, and an interface for
voltage values from 2.0 to 5.5 V is enabled when a voltage is detected on the target system side.
