C8051F300 Silicon Laboratories Inc, C8051F300 Datasheet - Page 36

• Manufacturer Part Number: C8051F300
• Description: IC 8051 MCU 8K FLASH 11MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F30xr

Specifications of C8051F300

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 8
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 11-VQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F300/1/2/3/4/5
5.3.2. Tracking Modes
The AD0TM bit in register ADC0CN controls the ADC0 track-and-hold mode. In its default state, the ADC0 input is
continuously tracked except when a conversion is in progress. When the AD0TM bit is logic 1, ADC0 operates in
low-power track-and-hold mode. In this mode, each conversion is preceded by a tracking period of 3 SAR clocks
(after the start-of-conversion signal). When the CNVSTR signal is used to initiate conversions in low-power tracking
mode, ADC0 tracks only when CNVSTR is low; conversion begins on the rising edge of CNVSTR (see Figure 5.4).
Tracking can also be disabled (shutdown) when the device is in low power standby or sleep modes. Low-power track-
and-hold mode is also useful when AMUX or PGA settings are frequently changed, due to the settling time require-
ments described in
36
Timer 0, Timer 2, Timer 1 Overflow
(AD0CM[2:0]=000, 001, 010, 011)
Write '1' to AD0BUSY,
Figure 5.4. 8-Bit ADC Track and Conversion Example Timing
Section “5.3.3. Settling Time Requirements” on page
(AD0CM[2:0]=1xx)
SAR Clocks
SAR Clocks
SAR Clocks
AD0TM=1
AD0TM=0
AD0TM=1
AD0TM=0
CNVSTR
Low Power
or Convert
Low Power
or Convert
Track or
Convert
A. ADC Timing for External Trigger Source
Track or Convert
B. ADC Timing for Internal Trigger Source
1
1
Rev. 2.3
Track
2
2
Track
3
3
Convert
4
4
1
5
5
2
6
6
3
Convert
7
7
Convert
Convert
4
8
8
37.
5
9
9
6
10 11 12
7
8
9
Low Power Mode
Low Power Mode
Track
Track