C8051F988-GM Silicon Laboratories Inc, C8051F988-GM Datasheet - Page 100
![IC MCU 8BIT 4KB FLASH 24QFN](/photos/12/15/121587/c8051f9xx_24-qfn_sml.jpg)
C8051F988-GM
Manufacturer Part Number
C8051F988-GM
Description
IC MCU 8BIT 4KB FLASH 24QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F9xxr
Specifications of C8051F988-GM
Program Memory Type
FLASH
Program Memory Size
4KB (4K x 8)
Package / Case
24-UQFN Exposed Pad, 24-HUQFN
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
17
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F9x
Core
8051
Data Ram Size
512 B
Interface Type
I2C, SMBus, Enhanced UART, Enhanced SPI
Maximum Clock Frequency
7 KHz
Number Of Programmable I/os
17
Number Of Timers
4
Operating Supply Voltage
2.4 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F996DK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 10 Channel
On-chip Dac
10 bit, 4 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1959-5
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- Download datasheet (3Mb)
C8051F99x-C8051F98x
8.4.
CS0 has the capability of measuring the total capacitance of multiple channels using a single conversion.
When the multiple channel feature is enabled (CS0MCEN = 1), Channels selected by CS0SCAN0/1 are
internally shorted together and the combined node is selected as the CS0 input. This mode can be used to
detect a capacitance change on multiple channels using a single conversion and is useful for implementing
“wake-on-multiple channels”.
8.5.
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 should be lowered
accordingly. The bits CS0CG[2:0] in register CS0MD set the gain value.
8.6.
CS0 has the capability of waking the device from a low power suspend mode upon detection of a “touch”
using the digital comparator. When the CS0SMEN is set to 1, CS0 may also wake up the device after an
end of scan event when CS0CM[2:0] are set to 101b or after each conversion when CS0CM[2:0] are set to
110b or 111b. If the accumulate feature is enabled, the device wakes up after all samples have been
accumulated. The CS0WOI bit in the CS0MD1 register can be used to configure desire wake from
suspend behavior.
8.7.
To achieve maximum power efficiency, CS0 should be enabled only when taking a conversion and dis-
abled at all other times. CS0 must be disabled by software prior to entering Sleep Mode.
100
CS0 Multiple Channel Enable
CS0 Gain Adjustment
Wake from Suspend
Using CS0 in Applications that Utilize Sleep Mode
Rev. 1.0
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