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C8051F300 Datasheet(PDF) 47 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 47 Page - List of Unclassifed Manufacturers |
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47 / 174 page  C8051F300/1/2/3/4/5 Rev. 2.6 47 6. Voltage Reference (C8051F300/2) The voltage reference MUX on C8051F300/2 devices is configurable to use an externally connected volt- age reference or the power supply voltage, VDD (see Figure 6.1). The REFSL bit in the Reference Control register (REF0CN) selects the reference source. For an external source, REFSL should be set to ‘0’; For VDD as the reference source, REFSL should be set to ‘1’. The BIASE bit enables the internal voltage bias generator, which is used by the ADC, Temperature Sensor, and Internal Oscillator. This bit is forced to logic 1 when any of the aforementioned peripherals is enabled. The bias generator may be enabled manually by writing a ‘1’ to the BIASE bit in register REF0CN; see SFR Definition 6.1 for REF0CN register details. The electrical specifications for the voltage reference cir- cuit are given in Table 6.1. Important Note About the VREF Input: Port pin P0.0 is used as the external VREF input. When using an external voltage reference, P0.0 should be configured as analog input and skipped by the Digital Crossbar. To configure P0.0 as analog input, set to ‘1’ Bit0 in register P0MDIN. To configure the Crossbar to skip P0.0, set to ‘1’ Bit0 in register XBR0. Refer to Section “12. Port Input/Output” on page 99 for complete Port I/O configuration details. The external reference voltage must be within the range 0 ≤ VREF ≤ VDD. On C8051F300/2 devices, the temperature sensor connects to the highest order input of the ADC0 positive input multiplexer (see Section “5.1. Analog Multiplexer and PGA” on page 34 for details). The TEMPE bit in register REF0CN enables/disables the temperature sensor. While disabled, the temperature sensor defaults to a high impedance state and any ADC0 measurements performed on the sensor result in mean- ingless data. Figure 6.1. Voltage Reference Functional Block Diagram Internal VREF (to ADC) To Analog Mux VDD VREF R1 VDD External Voltage Reference Circuit GND REF0CN Temp Sensor EN Bias Generator To ADC, Internal Oscillator, Temperature Sensor EN IOSCEN 0 1 |
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