C8051F045-GQ Silicon Laboratories Inc, C8051F045-GQ Datasheet - Page 113
![IC 8051 MCU 64K FLASH 64TQFP](/photos/12/18/121883/c8051f045-gq_sml.jpg)
C8051F045-GQ
Manufacturer Part Number
C8051F045-GQ
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F04xr
Specifications of C8051F045-GQ
Program Memory Type
FLASH
Program Memory Size
64KB (64K x 8)
Package / Case
64-TQFP, 64-VQFP
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
32
Ram Size
4.25K 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
Processor Series
C8051F0x
Core
8051
Data Bus Width
8 bit
Data Ram Size
4.25 KB
Interface Type
CAN/SMBus/SPI/UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
32
Number Of Timers
5
Operating Supply Voltage
2.7 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F040DK
Minimum Operating Temperature
- 40 C
On-chip Adc
13-ch x 10-bit
On-chip Dac
2-ch x 12-bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1210
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9.
The voltage reference circuit offers full flexibility in operating the ADC and DAC modules. Three voltage ref-
erence input pins allow each ADC and the two DACs (C8051F040/2 only) to reference an external voltage
reference or the on-chip voltage reference output. ADC0 may also reference the DAC0 output internally,
and ADC2 may reference the analog power supply voltage, via the VREF multiplexers shown in Figure 9.1.
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 via the VREF pin
to external system components or to the voltage reference input pins shown in Figure 9.1. Bypass capaci-
tors of 0.1 µF and 4.7 µF are recommended from the VREF pin to AGND, as shown in Figure 9.1. See
Table 9.1 for voltage reference specifications.
The Reference Control Register, REF0CN (defined in SFR Definition 9.1) enables/disables the internal ref-
erence generator and selects the reference inputs for ADC0 and ADC2. The BIASE bit in REF0CN 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 band-
gap is used as the reference voltage generator, BIASE and REFBE must both be set to logic 1. If the inter-
nal reference is not used, REFBE may be set to logic 0. Note that the BIASE bit must be set to logic 1 if
either DAC or ADC is used, regardless of the voltage reference used. If neither the ADC nor the DAC are
being used, both of these bits can be set to logic 0 to conserve power. Bits AD0VRS and AD2VRS select
the ADC0 and ADC2 voltage reference sources, respectively. The electrical specifications for the Voltage
Reference are given in Table 9.1.
The temperature sensor connects to the highest order input of the ADC0 input multiplexer (see
“5.1. Analog Multiplexer and PGA” on page 47
plexer and PGA” on page 69
disables the temperature sensor. While disabled, the temperature sensor defaults to a high impedance
state and any A/D measurements performed on the sensor while disabled result in meaningless data.
Voltage Reference (C8051F040/2/4/6)
Figure 9.1. Voltage Reference Functional Block Diagram
Reference
External
Voltage
Circuit
VDD
Recommended Bypass
4.7F
R1
for C8051F042/4/6 devices). The TEMPE bit within REF0CN enables and
Capacitors
0.1F
(C8051F040/2 only)
VREF2
VREF0
VREFD
VREF
Rev. 1.5
for C8051F040 devices, or
REF0CN
C8051F040/1/2/3/4/5/6/7
DAC0
DAC1
Ref
REFBE
x2
AV+
(C8051F040/2 only)
1
0
0
1
Band-Gap
BIASE
1.2V
EN
ADC2
Ref
ADC0
Ref
Section “6.1. Analog Multi-
Bias to
ADCs,
DACs
Section
113
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