5
91年11月28日
ES51977
3 3/4 AUTO EASY
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
NC
84
NC
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.