C8051F321R Silicon Laboratories Inc, C8051F321R Datasheet - Page 56

• Manufacturer Part Number: C8051F321R
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321R

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: 336-1067-2

C8051F320/1
56
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
Power Supply Rejection
EXTERNAL REFERENCE (REFBE = 0)
Input Voltage Range
Input Current
BIAS GENERATORS
ADC Bias Generator
Reference Bias Generator
Bits7-3:
Bit3:
Bit2:
Bit1:
Bit0:
R/W
Bit7
-
PARAMETER
UNUSED. Read = 00000b; Write = don’t care.
REFSL: Voltage Reference Select.
This bit selects the source for the internal voltage reference.
0: VREF pin used as voltage reference.
1: VDD used as voltage reference.
TEMPE: Temperature Sensor Enable Bit.
0: Internal Temperature Sensor off.
1: Internal Temperature Sensor on.
BIASE: Internal Analog Bias Generator Enable Bit.
0: Internal Bias Generator off.
1: Internal Bias Generator on.
REFBE: Internal Reference Buffer Enable Bit.
0: Internal Reference Buffer disabled.
1: Internal Reference Buffer enabled. Internal voltage reference driven on the VREF pin.
R/W
Bit6
-
VDD = 3.0 V; -40°C TO +85°C UNLESS OTHERWISE SPECIFIED
Table 6.1. Voltage Reference Electrical Characteristics
Figure 6.2. REF0CN: Reference Control Register
R/W
Bit5
-
25°C ambient
Load = 0 to 200 µA to GND
4.7µF tantalum, 0.1µF ceramic bypass
0.1µF ceramic bypass
no bypass cap
Sample Rate = 200 ksps; VREF = 3.0 V
BIASE = ‘1’
R/W
Bit4
-
CONDITIONS
Rev. 1.1
REFSL
R/W
Bit3
TEMPE
R/W
Bit2
MIN
2.38
BIASE
0
R/W
Bit1
TYP
2.44
140
100
1.5
15
20
10
12
40
2
REFBE
R/W
Bit0
MAX
VDD
2.50
10
SFR Address:
00000000
Reset Value
0xD1
ppm/µA
UNITS
ppm/°C
ppm/V
mA
µA
µA
µA
ms
µs
µs
V
V