C8051F300DK Silicon Laboratories Inc, C8051F300DK Datasheet - Page 40
C8051F300DK
Manufacturer Part Number
C8051F300DK
Description
DEV KIT F300/301/302/303/304/305
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F300DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F30x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F300
Silicon Family Name
C8051F30x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051 F300/001/002
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1246
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C8051F300/1/2/3/4/5
5.3.2. Tracking Modes
According to Table 5.1 on page 47, each ADC0 conversion must be preceded by a minimum tracking time
for the converted result to be accurate. 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 prog-
ress. 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
requirements described in
40
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
(AD0CM[2:0]=1xx)
SAR Clocks
AD0TM=1
AD0TM=0
AD0TM=1
AD0TM=0
CNVSTR
Section “5.3.3. Settling Time Requirements” on page
Clocks
Clocks
SAR
SAR
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. 2.9
Track
2
2
Track
3
3
4
4
1
5
5
Convert
2
6
6
3
7
7
4
8
8
Convert
5
9
9
Convert
Convert
10
6
10
7
11 12
11 12
8
9
13
41.
10
14 15
11 12
Track
Low Power
Low Power
Mode
Mode
Track
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