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ES51981 Arkusz danych(PDF) 4 Page - Cyrustek corporation

Numer części ES51981
Szczegółowy opis  3 1/2 AUTO DMM
Download  21 Pages
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Producent  CYRUSTEK [Cyrustek corporation]
Strona internetowa  http://www.cyrustek.com.tw
Logo CYRUSTEK - Cyrustek corporation

ES51981 Arkusz danych(HTML) 4 Page - Cyrustek corporation

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11/01/05
4
ES51981
3 1/2 AUTO DMM
…continued from previous page
49~50 SEG14~SEG1
3
O
LCD segment line 14~13
51~52
NC
53~64 SEG12~SEG0
1
O
LCD segment line 12~01
65
BP4
O
LCD backplane 4
66
BP3
O
LCD backplane 3
67
BP2
O
LCD backplane 2
68
BP1
O
LCD backplane 1
69
ANNUNC
O
Square wave output at the backplane frequency, synchronized to
BP1. ANNUNC can be used to control display annunciator. Con-
nect an LCD segment to ANNUNC to turn it on; connect an LCD
segment to its backplane to turn it off.
70
NC
71
BUZIN
I
Enables the buzzer. Low active.
72
BUZOUT
O
Outputs an 2KHz audio frequency signal for driving piezoelectric
buzzer when BUZIN is low.
73
NC
74
OSC2
O
Crystal oscillator output connection
75
OSC1
I
Crystal oscillator input connection
76
NC
77
XTAL
I
The chip uses internal RC oscillator if pin is connected to V-, and
uses external crystal oscillator if this pin is floating or connected to
DGND
78
NC
79
BKOUT
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.
80
NC
81
HOLD
I
Pulse low to enable HOLD mode.
82
RANGE
I
Pulse low to enable manual mode and manual range selection.
83
SLACDC
I
Select AC/DC initial state. This pin is pull low
84
KEY
I
Pulse low to change mode. In ADP mode, if this pin is connected to
V-, the buzzer output will be off when the ADP input overflows.
85
FC5
I
Switch 5 for function selection.
86
FC4
I
Switch 4 for function selection.
87
FC3
I
Switch 3 for function selection.
88
FC2
I
Switch 2 for function selection.
89
FC1
I
Switch 1 for function selection.
90
NC
91
C+
O
Positive capacitor connection for on-chip DC-DC converter.
92
C-
O
Negative capacitor connection for on-chip DC-DC converter.
93
NC
94
SDO
O
RS232 compliant serial data output.
95
LBAT9
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)
96
V-
P
Negative supply voltage. Connecting to battery negative terminal.
97
V-
P
Negative supply voltage. Connecting to battery negative terminal.
98
DGND
G
Digital ground, connected to battery positive terminal.
99
AGND
G
Analog ground.
100
AGND
G
Analog ground.


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