EM35X-DEV-UPG-IAR Ember, EM35X-DEV-UPG-IAR Datasheet - Page 184
EM35X-DEV-UPG-IAR
Manufacturer Part Number
EM35X-DEV-UPG-IAR
Description
IAR EWARM LICENCE FOR EM35X
Manufacturer
Ember
Type
Licenser
Specifications of EM35X-DEV-UPG-IAR
For Use With/related Products
EM35x
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
636-1028
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10.2
Interrupts
10.1.5.2 Input Range
The single-ended input range is fixed as 0 V to VREF and the differential input range is fixed as -VREF to
+VREF.
10.1.5.3 Sample Time
ADC sample time is programmed by selecting the sampling clock and the clocks per sample.
Table 10-4 shows the options for ADC sample times and the significant bits in the conversion results.
Note: ADC sample timing is the same whether the EM35x is using the 24 MHz crystal oscillator or the 12 MHz
high-speed RC oscillator. This facilitates using the ADC soon after the CPU wakes from deep sleep, before
switching to the crystal oscillator.
The ADC has its own top-level interrupt in the NVIC. The ADC interrupt is enabled by writing the INT_ADC bit
to the INT_CFGSET register, and cleared by writing the INT_ADC bit to the INT_CFGCLR register. Chapter 11,
Interrupt System, describes the interrupt system in detail.
Five kinds of ADC events can generate an ADC interrupt, and each has a bit flag in the INT_ADCFLAG register
to identify the reason(s) for the interrupt:
ADC_PERIOD
The sampling clock may be either 1 MHz or 6 MHz. If the ADC_1MHZCLK bit in the ADC_CFG register is
clear, the 6 MHz clock is used; if it is set, the 1 MHz clock is selected. The 6 MHz sample clock offers faster
conversion times but the ADC resolution is lower than that achieved with the 1 MHz clock.
The number of clocks per sample is determined by the ADC_PERIOD bits in the ADC_CFG register.
ADC_PERIOD values select from 32 to 4096 sampling clocks in powers of two. Longer sample times produce
more significant bits. Regardless of the sample time, converted samples are always 16-bits in size with the
significant bits left-aligned within the value.
INT_ADCOVF – an ADC conversion result was ready but the DMA was disabled (DMA buffer overflow).
INT_ADCSAT– the gain correction multiplication exceeded the limits for a signed 16-bit number (gain
saturation).
0
1
2
3
4
5
6
7
Sample
Clocks
1024
2048
4096
128
256
512
32
64
1 MHz clock
1024
2048
4096
128
256
512
32
64
Sample Time (µs)
Table 10-4. ADC Sample Times
Final
10-5
6 MHz clock
5.33
10.7
21.3
42.7
85.3
170
341
682
1 MHz clock
Sample Frequency (kHz)
0.977
0.488
0.244
31.3
15.6
7.81
3.91
1.95
6 MHz clock
EM351 / EM357
93.8
46.9
23.4
11.7
5.86
2.93
1.47
188
Significant Bits
120-035X-000G
10
11
12
13
14
7
8
9
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