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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADuC7023BCBZ62I-R7 датащи(PDF) 36 Page - Analog Devices |
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ADuC7023BCBZ62I-R7 датащи(HTML) 36 Page - Analog Devices |
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36 / 96 page  ADuC7023 Data Sheet | Page 36 of 96 BAND GAP REFERENCE The ADuC7023 provides an on-chip band gap reference of 2.5 V, which can be used for the ADC and DAC. This internal reference also appears on the VREF pin. When using the internal reference, a 0.47 μF capacitor must be connected from the external VREF pin to AGND to ensure stability and fast response during ADC conversions. This reference can also be connected to an external pin (VREF) and used as a reference for other circuits in the system. An external buffer is required because of the low drive capability of the VREF output. A programmable option also allows an external reference input on the VREF pin. REFCON Register Name: REFCON Address: 0xFFFF048C Default value: 0x00 Access: Read/write Function: The band gap reference interface consists of an 8-bit MMR REFCON described in Table 30. Table 30. REFCON MMR Bit Designations Bit Description 7 to 1 Reserved. 0 Internal reference output enable. This bit is set by the user to connect the internal 2.5 V reference to the VREF pin. The reference can be used for an external component but needs to be buffered. This bit is cleared by the user to disconnect the reference from the VREF pin. To connect an external reference source to the ADuC7023, configure REFCON = 0x01. ADC and the DACs can be configured to use the same or different reference resource. See Table 42. Rev. E |
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