HT16525
Pin Assignment
G21
G22
G23
G24
VH
VSS
OSCI
TEST
RST
CS
SCK
SI
VDD
P1
P2
AD2
AD1
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
1
60
2
59
3
58
4
57
5
56
6
55
7
54
8
53
9
52
HT16525
10
51
11
40
80 LQFP-A
12
49
13
48
47
14
46
15
45
16
44
17
43
18
42
19
20
41
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 3738 39 40
G20
G19
G18
G17
G16
G15
G14
G13
G12
G11
G10
G9
G8
G7
G6
G5
G4
G3
G2
G1
Pin Description
Pin Name
Power Supply Pins
VDD
VH
VSS
—
—
—
Positive power supply for logic circuits
Power supply for VFD driver circuits
VSS - ground pin
Chip select pin
When “Low”, the device is active.
Serial clock input
Shift clock input with data written on the SCK rising edge.
Serial data input.
The serial data is first shifted from LSB.
Initialize all the internal registers and commands.
All segments and digits are fixed at “Low” level.
When “Low” or open, the device is in normal mode.
When “High”, the device is in test mode.
High-voltage segment output pins.
High-voltage grid output pins.
High-voltage additional data segment output pins.
General port output.
Static operation output - can drive LEDs
Oscillator input pin
Connected to an external resistor and capacitor to generate the oscillation
frequency.
I/O
Description
Microcontroller Interface Pins
CS
SCK
SI
RST
TEST
Output Pins
S1~S40
G1~G24
AD1, AD2
P1, P2
Oscillator Pin
OSCI
I
O
O
O
O
I
I
I
I
I
Rev. 1.00
NC
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
S36
S37
S38
S39
S40
NC
NC
3
January 18, 2012
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
