C8051F505-IQ Silicon Laboratories Inc, C8051F505-IQ Datasheet - Page 230
![IC 8051 MCU 32K FLASH 48-QFP](/photos/12/17/121714/c8051f505-iq_sml.jpg)
C8051F505-IQ
Manufacturer Part Number
C8051F505-IQ
Description
IC 8051 MCU 32K FLASH 48-QFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F50xr
Specifications of C8051F505-IQ
Program Memory Type
FLASH
Program Memory Size
32KB (32K 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
336-1520
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F505-IQ
Manufacturer:
SLB
Quantity:
590
Company:
Part Number:
C8051F505-IQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F505-IQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
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C8051F50x/F51x
The SMBCS1–0 bits select the SMBus clock source, which is used only when operating as a master or
when the Free Timeout detection is enabled. When operating as a master, overflows from the selected
source determine the absolute minimum SCL low and high times as defined in Equation 23.1. Note that the
selected clock source may be shared by other peripherals so long as the timer is left running at all times.
For example, Timer 1 overflows may generate the SMBus and UART baud rates simultaneously. Timer
configuration is covered in Section “26. Timers” on page 265.
The selected clock source should be configured to establish the minimum SCL High and Low times as per
Equation 23.1. When the interface is operating as a master (and SCL is not driven or extended by any
other devices on the bus), the typical SMBus bit rate is approximated by Equation 23.2.
Figure 23.4 shows the typical SCL generation described by Equation 23.2. Notice that T
twice as large as T
extended low by slower slave devices, or driven low by contending master devices). The bit rate when
operating as a master will never exceed the limits defined by equation Equation 23.1.
230
Timer Source
Overflows
SCL
LOW
T
Equation 23.1. Minimum SCL High and Low Times
. The actual SCL output may vary due to other devices on the bus (SCL may be
Low
SMBCS1
0
0
1
1
T
Figure 23.4. Typical SMBus SCL Generation
HighMin
Table 23.1. SMBus Clock Source Selection
Equation 23.2. Typical SMBus Bit Rate
BitRate
SMBCS0
0
1
0
1
=
T
High
T
LowMin
=
f
-------------------------------------------------
ClockSourceOverflow
SMBus Clock Source
Timer 0 Overflow
Timer 1 Overflow
Timer 2 High Byte Overflow
Timer 2 Low Byte Overflow
Rev. 1.2
=
-------------------------------------------------
f
ClockSourceOverflow
3
1
SCL High Timeout
HIGH
is typically
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