C8051F712-GQ Silicon Laboratories Inc, C8051F712-GQ Datasheet - Page 67
![IC 8051 MCU 8K FLASH 48-TQFP](/photos/12/16/121695/c8051f712-gq_sml.jpg)
C8051F712-GQ
Manufacturer Part Number
C8051F712-GQ
Description
IC 8051 MCU 8K FLASH 48-TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F71xr
Specifications of C8051F712-GQ
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Cap Sense, POR, PWM, Temp Sensor, WDT
Number Of I /o
39
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Eeprom Size
32 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-TQFP, 48-VQFP
Processor Series
C8051F7x
Core
8051
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
I2C, SMBus, SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
39
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F700DK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 16 Channel
Package
48TQFP
Device Core
8051
Family Name
C8051F71x
Maximum Speed
25 MHz
Operating Supply Voltage
1.8|3 V
For Use With
336-1635 - DEV KIT FOR C8051F700
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
336-1644
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F712-GQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F712-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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11. Temperature Sensor
An on-chip temperature sensor is included on the C8051F700/2/4/6/8 and C8051F710/2/4/6 which can be
directly accessed via the ADC multiplexer in single-ended configuration. To use the ADC to measure the
temperature sensor, the ADC mux channel should be configured to connect to the temperature sensor.
The temperature sensor transfer function is shown in Figure 11.1. The output voltage (V
tive ADC input when the ADC multiplexer is set correctly. The TEMPE bit in register REF0CN enables/dis-
ables the temperature sensor, as described in SFR Definition 12.1. While disabled, the temperature sensor
defaults to a high impedance state and any ADC measurements performed on the sensor will result in
meaningless data. Refer to Table 9.12 for the slope and offset parameters of the temperature sensor.
11.1. Calibration
The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-
surements (see Table 5.1 for linearity specifications). For absolute temperature measurements, offset
and/or gain calibration is recommended. Typically a 1-point (offset) calibration includes the following steps:
1. Control/measure the ambient temperature (this temperature must be known).
2. Power the device, and delay for a few seconds to allow for self-heating.
3. Perform an ADC conversion with the temperature sensor selected as the ADC’s input.
4. Calculate the offset characteristics, and store this value in non-volatile memory for use with subsequent
Figure 5.3 shows the typical temperature sensor error assuming a 1-point calibration at 0 °C.
temperature sensor measurements.
Figure 11.1. Temperature Sensor Transfer Function
V
Temp
TEMP
C
=
= (V
(Slope
TEMP
x Temp
- Offset) /
Temperature
Rev. 1.0
C
) +
Offset
Slope
Offset
(V at 0 Celsius)
Slope
C8051F70x/71x
(V / deg C)
TEMP
) is the posi-
67
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