5

92年8月4日

ES51988

3 3/4 AUTO REL/MAX/MIN

Pin. No Symbol.

Description.

73

NC

74

BUZOUT

Buzzer output. Audio frequency (2.0KHz) output which drives a

piezoelectric buzzer.

75

NC

76

NC

77

NC

78

NC

79

OSC1

Crystal oscillator (input) connection.

80

OSC2

Crystal oscillator (output) connection.

81

NC

82

KEY

Mode change pin.

83

REL

Input to get relative display. Pulse low to make this function active.

84

MAX/MIN Input to set MAX/MIN display. Pulse low to make this function active.

85

HOLD

Input to hold display. Pulse low to make this function active.

86

RANGE

Input to set automatic/manual mode and manual range selection. Pulse

low to make this function active.

87

FC5

Switch 5 for function selection.

88

FC4

Switch 4 for function selection.

89

FC3

Switch 3 for function selection.

90

FC2

Switch 2 for function selection.

91

FC1

Switch 1 for function selection.

92

LBAT9

Low battery voltage setting. If used 3V battery, connected this pin to

AGND, the default low battery voltage will be –2.3V. If used 9V

battery, when the input voltage is small than VRH(-1.2V), the low

battery annunciator will be display.

93

SDO

Serial data output.

94

C+

Positive capacitor connection for on-chip DC-DC converter.

95

C-

Negative capacitor connection for on-chip DC-DC converter.

96

V-

Negative supply voltage.Connecting to battery negative terminal.

97

V-

Negative supply voltage.Connecting to battery negative terminal.

98

DGND

Digital ground,connected to battery positive terminal.

99

AGND

Analog ground.

100

AGND

Analog ground.