Copyright 1998 National Semiconductor Corp.

5

www.national.com

P1[5]

36

2

INPUT/OUTPUT with selectable pull up resistor and 12 mA drive current. General

purpose memory mapped I/O port bit. Can be programmed to generate an internal

interrupt.

P1[6]

37

2

INPUT/OUTPUT with selectable pull up resistor and 12 mA drive current. General

purpose memory mapped I/O port. Can be programmed to generate an internal

interrupt.

P1[7]

38

4

INPUT/OUTPUT with open drain with 12 mA sink capability. Can be used to control

a LED connected to Vbat. Can be programmed to generate an internal interrupt.

VDD

39

Digital supply voltage

VSS

40

Digital ground

P2[0] or

PWM

41

4

INPUT/OUTPUT with open drain with 100mA sink capability. This pin can be con-

figured as single ended buzzer driver with Pulse Width Modulated (PWM) output.

Can also be used for battery charge control.

P2[1] or

Buzzer+

42

1

INPUT/OUTPUT. General purpose memory mapped I/O port bit. P2[1,2] can be

configured as complementary PWM output for e.g. buzzer control. P2[1,2] can

drive 12 mA.

P2[2] or

Buzzer-

43

1

INPUT/OUTPUT. General purpose memory mapped I/O port bit. P2[1,2] can be

configured as complementary PWM output for e.g. buzzer control. P2[1,2] can

drive 12 mA.

P2[3]

44

1

INPUT/OUTPUT. General purpose memory mapped I/O port bit.

P2[4]

45

1

INPUT/OUTPUT. General purpose memory mapped I/O port bit.

VBAT2

46

analog

INPUT. Battery voltage. (upto 5V input)

VPP

47

Reserved for future onboard OTP ROM.

VBAT1

48

analog

INPUT. Battery voltage. (upto 5V input)

TP

49

INPUT. Testpin for production test must be connected to Vss.

PON

50

analog

INPUT. Power ON. Uses Vbat input supply.

CHARGE

51

analog

INPUT. Charger connected indication. Uses Vbat input supply.

REG_ON

52

5

OUTPUT. Uses Vbat input supply. Switch external regulator on

P2[5]

53

5/analog

DIGITAL OUTPUT/ANALOG INPUT. P2[5] 8 bit multiplexed ADC inputs. P2[5] can

also be used as a digital output

Vref+

54

analog

OUTPUT. Positive microphone reference

MIC+

55

analog

INPUT. Positive microphone input

AGND

56

analog

POWER. Signal ground.

MIC-

57

analog

INPUT. Negative microphone input.

Vref-

58

analog

OUTPUT. Negative microphone reference

LRS-

59

analog

OUTPUT. Negative loudspeaker output

LRS+

60

analog

OUTPUT. Positive loudspeaker output

AVD2

61

Analog supply voltage for CODEC, Xtal oscillator and 8 bit DAC (pin 63)

AVS2

62

Analog ground.

DAC

63

analog

8 bit DAC output for frequency control.

CAP

64

analog

External capacitor.

Xtal1

65

analog

INPUT. 10.368MHz crystal connection.

VSS

66

Digital ground

VDD

67

Digital supply voltage

RSTn

68

1

INPUT/OUTPUT. Active low Reset input with open collector output and pull down

resistor.

HOLD

69

6

INPUT with pull down. Hold processor operation. For e.g. In Circuit Emulation. The

system bus interface will TRI-STATE data and address bus and all control signals.

In this mode an external CR16A can control the SC14402 completely.

Table 1:

Pin Description

PIN NAME

TYPE

DESCRIPTION