Rev. 1.00

3

January 18, 2012

HT16525

Pin Assignment

S4

S5

S6

S7

S8

S9

S10

S11

S12

S13

S14

S15

S16

S17

S18

S19

S20

S21

S22

S23

G20

G19

G18

G17

G16

G15

G14

G13

G12

G11

G10

G9

G8

G7

G6

G5

G4

G3

G2

G1

47

46

45

44

43

42

41

HT16525

80 LQFP-A

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 3738 39 40

80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 6463 62 61

60

59

58

57

56

55

54

53

52

51

40

49

48

Pin Description

Pin Name

I/O

Description

Power Supply Pins

VDD

—

Positive power supply for logic circuits

VH

—

Power supply for VFD driver circuits

VSS

—

VSS - ground pin

Microcontroller Interface Pins

CS

I

Chip select pin

When “Low”, the device is active.

SCK

I

Serial clock input

Shift clock input with data written on the SCK rising edge.

SI

I

Serial data input.

The serial data is first shifted from LSB.

RST

I

Initialize all the internal registers and commands.

All segments and digits are fixed at “Low” level.

TEST

I

When “Low” or open, the device is in normal mode.

When “High”, the device is in test mode.

Output Pins

S1~S40

O

High-voltage segment output pins.

G1~G24

O

High-voltage grid output pins.

AD1, AD2

O

High-voltage additional data segment output pins.

P1, P2

O

General port output.

Static operation output - can drive LEDs

Oscillator Pin

OSCI

I

Oscillator input pin

Connected to an external resistor and capacitor to generate the oscillation

frequency.