ES51918
11,000 Counts Auto DMM
44
SLEEP
45
FREQ
46
RS232
47
OHMC2
48
OHMC3
49 - 66 SEG18 – SEG01
67
BP4
68
BP3
69
BP2
70
BP1
71
ANNUNC
Sleep mode indicator, asserts low in SLEEP mode.
Frequency counter input, offset V-/2 internally by the chip.
Assert low to enable serial data output.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
LCD segment line 01 – 18
LCD backplane 4
LCD backplane 3
LCD backplane 2
LCD backplane 1
Square wave output at the backplane frequency, synchronized to
BP1. ANNUNC can be used to control display annunciator. Connect a
LCD segment to ANNUNC to turn it on; connect an LCD segment to
its backplane to turn it off.
I
Pull to V- to enable the BUZOUT.
O Outputs a 2KHz audio frequency signal for driving piezoelectric buzze
when BUZIN is low.
O If BKLIT function is enabled, this pin will change from –3V to +3V
For 60 sec, once press BKLIT pin again within 60 sec, this pin will
Change back to –3V.
I
Pulse to V- to enable MAX/MIN function.
I
Pulse to V- to enable VAHZ mode.
I
Pulse to V- to enable Peak Hold mode.
I
Pulse to V- to enable Relative function or Zero function.
I
Pulse to V- to enable HOLD function.
I
Pulse to V- to enable manual mode and manual range selection.
I
Crystal oscillator input connection
O Crystal oscillator output connection
I
Idle time selection for auto power off feature.
I
CE selection feature control pin.
I
Back light function. Pulse low to set BKOUT pin output.
I
Pulse to V- to change mode. In ADP mode, if this pin is connected to
V-, the buzzer output will be off when the ADP input overflows.
I
Select initial state. Please refer to page 15
I
Switch 5 for function selection.
I
Switch 4 for function selection.
I
Switch 3 for function selection.
I
Switch 2 for function selection.
I
Switch 1 for function selection.
I
Low battery configuration. If 3V battery is used, connect it to AGND.
The default low-battery threshold voltage is –2.3V. If 9V battery is
Used, the low battery annunciator is displayed when the voltage of
this pin is less than VRH (-1.2V)
O RS232 compliant serial data output.
O Positive capacitor connection for on-chip DC-DC converter.
O Negative capacitor connection for on-chip DC-DC converter.
P Negative supply voltage. Connecting to 3V battery negative terminal.
P/G Digital ground. Connecting to 3V battery positive terminal.
P/G Analog ground.
P/G Analog ground.
O
I
I
O
O
O
O
O
O
O
O
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
BUZIN
BUZOUT
BKOUT
MAXMIN
VAHZ
PEAK
REL_ZERO
HOLD
RANGE
OSC1
OSC2
APOSEL
CESEL
BKLIT
KEY
SLACDC
FC5
FC4
FC3
FC2
FC1
LBAT9
94
95
96
97
98
99
100
SDO
C+
C-
V-
DGND
AGND
AGND
v1.08
4
06/04/03
CYRUSTEK [ Cyrustek corporation ]
