C8051F317-GMR Silicon Laboratories Inc, C8051F317-GMR Datasheet - Page 52

• Manufacturer Part Number: C8051F317-GMR
• Description: MCU 8-Bit C8051F31x 8051 CISC 16KB Flash 3.3V 24-Pin QFN EP T/R
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051F317-GMR

• Package: 24QFN EP
• Device Core: 8051
• Family Name: C8051F31x
• Maximum Speed: 25 MHz
• Ram Size: 1.25 KB
• Program Memory Size: 16 KB
• Operating Supply Voltage: 3.3 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 21
• Interface Type: I2C/SMBus/SPI/UART
• On-chip Adc: 17-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4

C8051F310/1/2/3/4/5/6/7
Inputs are measured from ‘0’ to VREF * 1023/1024. Example codes are shown below for both right-justified
and left-justified data. Unused bits in the ADC0H and ADC0L registers are set to ‘0’.
When in Differential Mode, conversion codes are represented as 10-bit signed 2’s complement numbers.
Inputs are measured from -VREF to VREF * 511/512. Example codes are shown below for both right-justi-
fied and left-justified data. For right-justified data, the unused MSBs of ADC0H are a sign-extension of the
data word. For left-justified data, the unused LSBs in the ADC0L register are set to ‘0’.
Important Note About ADC0 Input Configuration: Port pins selected as ADC0 inputs should be config-
ured as analog inputs, and should be skipped by the Digital Crossbar. To configure a Port pin for analog
input, set to ‘0’ the corresponding bit in register PnMDIN (for n = 0,1,2,3). To force the Crossbar to skip a
Port pin, set to ‘1’ the corresponding bit in register PnSKIP (for n = 0,1,2). See
Output” on page 129
5.2.
The typical temperature sensor transfer function is shown in Figure 5.2. The output voltage (V
positive ADC input when the temperature sensor is selected by bits AMX0P4-0 in register AMX0P.
52
VREF x 1023/1024
VREF x 512/1024
VREF x 256/1024
–VREF x 256/512
VREF x 256/512
VREF x 511/512
Temperature Sensor
Input Voltage
Input Voltage
–VREF
0
0
Figure 5.2. Typical Temperature Sensor Transfer Function
for more Port I/O configuration details.
1200
1100
1000
(mV)
900
800
700
-50
Right-Justified ADC0H:ADC0L
Right-Justified ADC0H:ADC0L
(AD0LJST = 0)
(AD0LJST = 0)
0
0x03FF
0x0200
0x0100
0x0000
0x01FF
0xFE00
0x0100
0x0000
0xFF00
Rev. 1.7
V
TEMP
50
= 3.35*(TEMP
C
100
) + 897 mV
Left-Justified ADC0H:ADC0L
Left-Justified ADC0H:ADC0L
(Celsius)
(AD0LJST = 1)
(AD0LJST = 1)
Section “13. Port Input/
0xFFC0
0x8000
0x4000
0x0000
0x7FC0
0xC000
0x4000
0x0000
0x8000
TEMP
) is the