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SLG46400 Scheda tecnica(PDF) 39 Page - Dialog Semiconductor |
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SLG46400 Scheda tecnica(HTML) 39 Page - Dialog Semiconductor |
39 / 95 page 000-0046400-109 Page 33 of 89 SLG46400 11.0 Voltage Reference Out (VREF Out) The VREF macro cell supplies an accurate reference voltage for the SLG46400. 11.1 VREF Output The output of the VREF cell can be connected to PIN 10 as a buffered or non-buffered output. In order to use the VREF cell within the SLG46400, the VREF output enable signal (reg<741>) must be turned on. When the op amp output buffer is enabled through the Vrefo_buf_en signal (reg<740>) the PIN 10 output voltage reference’s impedance becomes 1kΩ. With the op amp buffer switched out, the PIN 10 output voltage reference’s impedance is 100kΩ. 11.2 VREF Sources The value of VREF can be set to either use VDD/3 as a voltage source or by setting the ACMP0 to provide the desired voltage (50mV to 1.5V or 30mV to 1.0V is selectable). The VREF macro cell uses ACMP0’s negative input for the desired reference voltage. 11.3 VREF Functional Diagram Figure 11. VREF Functional Diagram 1 0 VDD/3 ACMP0_VREF Power On reg <744> reg <725:722> cvref reg <743> OP 1 0 reg <740> reg <741> Vrefo_en OUT PIN 10 reg <736> |
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