C8051F706-GQ Silicon Laboratories Inc, C8051F706-GQ Datasheet - Page 81
![IC 8051 MCU 16K FLASH 48-TQFP](/photos/12/17/121753/c8051f706-gq_sml.jpg)
C8051F706-GQ
Manufacturer Part Number
C8051F706-GQ
Description
IC 8051 MCU 16K FLASH 48-TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F70xr
Specifications of C8051F706-GQ
Program Memory Type
FLASH
Program Memory Size
16KB (16K x 8)
Package / Case
48-TQFP, 48-VQFP
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Cap Sense, POR, PWM, Temp Sensor, WDT
Number Of I /o
39
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F7x
Core
8051
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
I2C, SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
39
Number Of Timers
4 x 16 bit
Operating Supply Voltage
1.8 V to 3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F700DK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 16 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1635 - DEV KIT FOR C8051F700
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1636
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F706-GQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F706-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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15.1. Configuring Port Pins as Capacitive Sense Inputs
In order for a port pin to be measured by CS0, that port pin must be configured as an analog input (see “28.
Port Input/Output” ). Configuring the input multiplexer to a port pin not configured as an analog input will
cause the capacitance-to-digital converter to output incorrect measurements.
Note: When CS0 begins a conversion to measure capacitance on a port pin, CS0 grounds all other port pins that
15.2. CS0 Gain Adjustment
The gain of the CS0 circuit can be adjusted in integer increments from 1x to 8x (8x is the default). High
gain gives the best sensitivity and resolution for small capacitors, such as those typically implemented as
touch-sensitive PCB features. To measure larger capacitance values, the gain can be lowered. However,
lower gain values will affect the overall conversion time. SeeTable 15.1 for more details on the gain adjust-
ment. The bits CS0CG[2:0] in register CS0MD1 set the gain value.
15.3. Capacitive Sense Start-Of-Conversion Sources
A capacitive sense conversion can be initiated in one of seven ways, depending on the programmed state
of the CS0 start of conversion bits (CS0CF6:4). Conversions may be initiated by one of the following:
1. Writing a 1 to the CS0BUSY bit of register CS0CN
2. Timer 0 overflow
3. Timer 2 overflow
4. Timer 1 overflow
5. Timer 3 overflow
6. Convert continuously
7. Convert continuously with auto-scan enabled
Notes:
CS0CG[2:0] (Gain)
1. The maximum total capacitance values listed in this table are for guidance only, and are not a specification.
2. Conversion times are nominal, and listed for 13-bit conversions with all other CS0 settings at their default
meet the following requirements:
- The port pin is accessible by the CS0 input multiplexer.
- The port pin is configured as an analog input.
- The port latch contains a 0.
The total measured capacitance will include internal capacitance as well as external parasitics, and the actual
external capacitance being measured. Please refer to the Electrical Specifications for details on the maximum
external capacitance.
values.
000b (1x)
001b (2x)
010b (3x)
011b (4x)
100b (5x)
101b (6x)
110b (7x)
111b (8x)
Table 15.1. Gain Setting vs. Maximum Capacitance and Conversion Time
Maximum Total Capacitance (pF)
520
260
175
130
105
85
75
65
Rev. 1.0
1
C8051F70x/71x
Conversion Time (µs)
178
93
66
52
43
38
34
31
2
81
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