C8051F023R Silicon Laboratories Inc, C8051F023R Datasheet - Page 94

• Manufacturer Part Number: C8051F023R
• Description: IC 8051 MCU 64K FLASH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F02xr

Specifications of C8051F023R

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b, 8x10b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: 336-1035-2

C8051F020/1/2/3
The temperature sensor connects to the highest order input of the ADC0 input multiplexer (see
Multiplexer and PGA” on page 43
page 59
While disabled, the temperature sensor defaults to a high impedance state and any A/D measurements performed on
the sensor while disabled result in undefined data.
94
VDD = 3.0 V, AV+ = 3.0 V, -40°C to +85°C unless otherwise specified
INTERNAL REFERENCE (REFBE = 1)
Output Voltage
VREF Short-Circuit Current
VREF Temperature Coefficient
Load Regulation
VREF Turn-on Time 1
VREF Turn-on Time 2
VREF Turn-on Time 3
EXTERNAL REFERENCE (REFBE = 0)
Input Voltage Range
Input Current
Bits7-5:
Bit4:
Bit3:
Bit2:
Bit1:
Bit0:
R/W
Bit7
-
for C8051F022/3 devices). The TEMPE bit within REF0CN enables and disables the temperature sensor.
PARAMETER
UNUSED. Read = 000b; Write = don’t care.
AD0VRS: ADC0 Voltage Reference Select
0: ADC0 voltage reference from VREFA pin.
1: ADC0 voltage reference from DAC0 output.
AD1VRS: ADC1 Voltage Reference Select
0: ADC1 voltage reference from VREFA pin.
1: ADC1 voltage reference from AV+.
TEMPE: Temperature Sensor Enable Bit.
0: Internal Temperature Sensor Off.
1: Internal Temperature Sensor On.
BIASE: ADC/DAC Bias Generator Enable Bit. (Must be ‘1’ if using ADC or DAC).
0: Internal Bias Generator Off.
1: Internal Bias Generator On.
REFBE: Internal Reference Buffer Enable Bit.
0: Internal Reference Buffer Off.
1: Internal Reference Buffer On. Internal voltage reference is driven on the VREF pin.
R/W
Bit6
-
Table 10.1. Voltage Reference Electrical Characteristics
Figure 10.2. REF0CN: Reference Control Register
R/W
Bit5
-
25°C ambient
Load = 0 to 200 µA to AGND
4.7µF tantalum, 0.1µF ceramic bypass
0.1µF ceramic bypass
no bypass cap
for C8051F020/1 devices, or
AD0VRS
R/W
Bit4
CONDITIONS
AD1VRS
Rev. 1.4
R/W
Bit3
Section “6.1. Analog Multiplexer and PGA” on
TEMPE
R/W
Bit2
MIN
2.36
1.00
BIASE
R/W
Bit1
TYP
2.43
0.5
15
20
10
2
0
REFBE
R/W
Bit0
(AV+) -
Section “5.1. Analog
MAX
2.48
30
0.3
1
SFR Address:
00000000
Reset Value
0xD1
ppm/µA
UNITS
ppm/°C
mA
µA
ms
µs
µs
V
V