C8051F061 Silicon Laboratories Inc, C8051F061 Datasheet - Page 115
C8051F061
Manufacturer Part Number
C8051F061
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F06xr
Specifications of C8051F061
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
24
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 2x16b, 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
-
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11.
The internal voltage reference circuit consists of a 1.2 V, temperature stable bandgap voltage reference
generator and a gain-of-two output buffer amplifier. The internal reference may be routed to the VREF pin
as shown in Figure 11.1. The maximum load seen by the VREF pin must be less than 200 µA to AGND.
Bypass capacitors of 0.1 µF and 4.7 µF are recommended from the VREF pin to AGND, as shown in
Figure 11.1.
The Reference Control Register 2, REF2CN (defined in Figure 11.2) enables/disables the internal refer-
ence generator. The BIASE bit in REF2CN enables the on-board reference generator while the REFBE bit
enables the gain-of-two buffer amplifier which drives the VREF pin. When disabled, the supply current
drawn by the bandgap and buffer amplifier falls to less than 1 µA (typical) and the output of the buffer
amplifier enters a high impedance state. If the internal bandgap is used as the reference voltage generator,
BIASE and REFBE must both be set to logic 1. If the internal reference is not used, REFBE may be set to
logic 0. The electrical specifications for the Voltage Reference are given in Table 11.1.
Voltage Reference 2 (C8051F064/5/6/7)
External
Circuitry
Figure 11.1. Voltage Reference Functional Block Diagram
Recommended Bypass
4.7F
Capacitors
+
0.1F
Rev. 1.2
VREF
C8051F060/1/2/3/4/5/6/7
REFBE
x2
Band-Gap
BIASE
1.2V
EN
115
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