C8051F350-TB Silicon Laboratories Inc, C8051F350-TB Datasheet - Page 47
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C8051F350-TB
Manufacturer Part Number
C8051F350-TB
Description
PROTOTYPINGBOARDWITH C8051F350
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F350-TB
Contents
Board
Processor To Be Evaluated
C8051F35x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F350
Silicon Family Name
C8051F35x
Kit Contents
Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F350
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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5.3.1. Error Conditions
Any errors during a conversion or calibration are indicated using bits in the ADC0STA register. The
AD0S3C flag will be set to ‘1’ if there is a SINC3 filter clip during the conversion. Likewise, the AD0FFC
flag will be set to ‘1’ if there is a Fast filter clip during the conversion. A filter clip occurs whenever an inter-
nal filter register overflows during a conversion. The AD0OVR flag will be set to ‘1’ if an ADC overrun con-
dition occurs. An overrun occurs if the end of a conversion is reached while the AD0INT flag is still set to ‘1’
from the previous conversion. If the data registers have not been read, the new data values will be
updated, and the previous conversion will be lost. The general AD0ERR flag indicates that an AD0S3C,
AD0FFC, or AD0OVR error condition has occurred, or that a calibration resulted in a value that was
beyond the limits of the offset or gain register. The data output registers are updated at the end of every
conversion regardless of whether or not an error occurs.
5.4.
An 8-bit offset DAC is included, which can be used for offset correction up to approximately ±1/2 of the
ADC’s input range on any PGA gain setting. The ADC0DAC register (SFR Definition 5.7) controls the off-
set DAC voltage. The register is decoded as a signed binary word. The MSB (bit 7) determines the sign of
the DAC magnitude (0 = positive, 1 = negative), and the remaining seven bits (bits 6–0) determine the
magnitude. Each LSB of the offset DAC is equivalent to approximately 0.4% of the ADC’s input span. A
write to the ADC0DAC register initiates a change on the offset DAC output.
5.5.
The burnout current sources can be used to detect an open circuit or short circuit at the ADC inputs. The
burnout current sources are enabled by setting the AD0BCE bit in register ADC0CN to ‘1’ (SFR Definition
5.1). The positive-channel burnout current source sources approximately 2 µA on AIN+, and the negative-
channel burnout current sinks approximately 2 µA on AIN–. If an open circuit exists between AIN+ and
AIN– when the burnout current sources are enabled, the ADC will read a full scale positive value. If a
short-circuit exists between AIN+ and AIN– when the burnout current sources are enabled, the ADC will
read a value near zero. The burnout current sources should be disabled during normal ADC measure-
ments.
*Note: Input Voltage is voltage at ADC inputs after amplification by the PGA.
Input Voltage* (AIN+ – AIN–) 24-bit Output Word (C8051F350/1) 16-bit Output Word (C8051F352/3)
*Note: Input Voltage is voltage at ADC inputs after amplification by the PGA.
Input Voltage* (AIN+ – AIN–) 24-bit Output Word (C8051F350/1) 16-bit Output Word (C8051F352/3)
VREF – 1 LSB
VREF – 1 LSB
Offset DAC
Burnout Current Sources
–VREF / 2
VREF / 2
VREF / 2
+1 LSB
+1 LSB
–1 LSB
–VREF
Table 5.1. ADC0 Unipolar Output Word Coding (AD0POL = 0)
0
Table 5.2. ADC0 Bipolar Output Word Coding (AD0POL = 1)
0
0xFFFFFF
0x800000
0x000001
0x000000
0xFFFFFF
0x7FFFFF
0xC00000
0x400000
0x000001
0x000000
0x800000
Rev. 1.1
C8051F350/1/2/3
0xFFFF
0x8000
0x0001
0x0000
0x7FFF
0xFFFF
0xC000
0x4000
0x0001
0x0000
0x8000
47
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