sh6622a SinoWealth Micro-Electronics Corp. Ltd, sh6622a Datasheet - Page 22

• Manufacturer Part Number: sh6622a
• Description: Mask 4-bit Microcontroller
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

AP5 (Weight Scale)
(1) Operating voltage: 5.0V
(2) Oscillator: Ceramic resonator 4MHz
(3) Port A0: External interrupt input for ON/OFF switch
(4) Port E2, E3, F1, A2: S4 - S1 analog switch control signals that control Vil to be charged and discharged by both the reference
(5) Other Ports: Sink seven-segment LED current directly. 0 - 199 can be displayed in this configuration
voltage (Vref) and the amplified voltage (Vo). The charged and discharged times are determined by the values of C1, R4 and
the threshold voltage of T
Load
Cell
V
DD
Vi
V
o
= (1 + 2R
Instrumentation Amplifier
R2
R1
R2
0
input pin and the ADC resolution could be up to 8 bit
2
R3
R3
/R
1
) (R
R4
R5
4
/R
Vo
3
) V
0.1u
47K
i
Vref
R6
S1
S2
C1
S3
22
100Ω
Vi1
S4
S1
S2
S3
S4
10
11
12
13
14
1
3
4
5
6
7
8
9
2
PE2
PE3
PF1
PA2
PA3
RESET
GND
PB0
PB1
PB2
PB3
PD0
PD1
T0
OSCO
OSCI
PC2
PC0
PD3
PA1
PA0
PC3
PC1
PD2
a b c d e f g
PE1
PE0
PF0
V
DD
21
17
28
27
26
25
24
23
22
20
19
18
16
15
V
DD
a b c d e f g
V
DD
ON/OFF
1
2
120P - 470P
a b c d e f g
120P - 470P
XC1
C
SH6622A
C