C8051F501-IQ Silicon Laboratories Inc, C8051F501-IQ Datasheet - Page 73
![IC 8051 MCU 64K FLASH 48-QFP](/photos/12/17/121736/c8051f501-iq_sml.jpg)
C8051F501-IQ
Manufacturer Part Number
C8051F501-IQ
Description
IC 8051 MCU 64K FLASH 48-QFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F50xr
Specifications of C8051F501-IQ
Program Memory Type
FLASH
Program Memory Size
64KB (64K x 8)
Package / Case
48-QFP
Mfg Application Notes
LIN Bootloader AppNote
Core Processor
8051
Core Size
8-Bit
Speed
50MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
POR, PWM, Temp Sensor, WDT
Number Of I /o
40
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.25 V
Data Converters
A/D 32x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Processor Series
C8051F5x
Core
8051
Data Bus Width
8 bit
Data Ram Size
4.25 KB
Interface Type
I2C/SPI/UART
Maximum Clock Frequency
50 MHz
Number Of Programmable I/os
40
Number Of Timers
4
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F500DK
Minimum Operating Temperature
- 40 C
On-chip Adc
32-ch x 12-bit
Package
48PQFP
Device Core
8051
Family Name
C8051F50x
Maximum Speed
50 MHz
Operating Supply Voltage
2.5|3.3|5 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1527 - KIT DEV FOR C8051F50X
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1512
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F501-IQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F501-IQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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8. Voltage Reference
The Voltage reference multiplexer on the C8051F50x/F51x devices is configurable to use an externally
connected voltage reference, the on-chip reference voltage generator routed to the VREF pin, or the V
power supply voltage (see Figure 8.1). The REFSL bit in the Reference Control register (REF0CN, SFR
Definition 8.1) selects the reference source for the ADC. For an external source or the on-chip reference,
REFSL should be set to 0 to select the VREF pin. To use V
set to 1.
The BIASE bit enables the internal voltage bias generator, which is used by the ADC, Temperature Sensor,
and internal oscillator. This bias is automatically enabled when any peripheral which requires it is enabled,
and it does not need to be enabled manually. The bias generator may be enabled manually by writing a 1
to the BIASE bit in register REF0CN. The electrical specifications for the voltage reference circuit are given
in Table 5.11.
The on-chip voltage reference circuit consists of a temperature stable bandgap voltage reference genera-
tor and a gain-of-two output buffer amplifier. The output voltage is selectable between 1.5 V and 2.25 V.
The on-chip voltage reference can be driven on the VREF pin by setting the REFBE bit in register REF0CN
to a 1. The maximum load seen by the VREF pin must be less than 200 µA to GND. Bypass capacitors of
0.1 µF and 4.7 µF are recommended from the VREF pin to GND. If the on-chip reference is not used, the
REFBE bit should be cleared to 0. Electrical specifications for the on-chip voltage reference are given in
Table 5.11.
Important Note about the VREF Pin: When using either an external voltage reference or the on-chip ref-
erence circuitry, the VREF pin should be configured as an analog pin and skipped by the Digital Crossbar.
Refer to Section “20. Port Input/Output” on page 177 for the location of the VREF pin, as well as details of
how to configure the pin in analog mode and to be skipped by the crossbar.
GND
VDD
4.7F
Recommended Bypass
R1
Figure 8.1. Voltage Reference Functional Block Diagram
Capacitors
+
Reference
External
Voltage
Circuit
0.1F
VREF
VDD
REF0CN
Rev. 1.2
0
1
IOSCE
N
Reference
DD
REFBE
Internal
EN
as the reference source, REFSL should be
EN
EN
Bias Generator
Temp Sensor
C8051F50x/F51x
To Analog Mux
(to ADC)
VREF
To ADC, Internal
Oscillators
DD
73
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