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ES51986 Folha de dados(PDF) 4 Page - Cyrustek corporation |
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ES51986 Folha de dados(HTML) 4 Page - Cyrustek corporation |
4 / 23 page 07/01/02 4 ES51986 6000 Count AUTO DMM …continued from previous page 52 NC 53~64 SEG12~SEG01 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 MAXMIN I Max/Min input pin. Pulse to V- to enable function. 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. Please refer to page 10 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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