AT83EB5114 Atmel Corporation, AT83EB5114 Datasheet - Page 57

• Manufacturer Part Number: AT83EB5114
• Manufacturer: Atmel Corporation

Specifications of AT83EB5114

• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 11
• Adc Channels: 6
• Adc Resolution (bits): 10
• Adc Speed (ksps): 50
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Mask Rom (kbytes): 4
• Watchdog: Yes

Analog-to-Digital
Converter (ADC)
Features
4311C–8051–02/08
This section describes the on-chip 10 bit analog-to-digital converter of the AT8xEB5114.
Six ADC channels are available for sampling of the external sources AIN0 to AIN5. An
analog multiplexer allows the single ADC converter to select one from the 6 ADC chan-
nels as ADC input voltage (ADCIN). ADCIN is converted by the 10 bit-cascaded
potentiometric ADC.
8 to 10 bits resolution can only be reached while using an external voltage reference.
For the precision conversion, set bits PSIDLE and ADSST in ADCON register to start
the conversion. The chip is in a pseudo-idle mode, the CPU doesn’t run but the periph-
erals are always running. This mode allows digital noise to be lower, to ensure precise
conversion.
For accurate conversion, set bits QUIETM and ADSST in ADCON register to start the
conversion. The chip is in a quiet mode, the AD is the only peripheral running. This
mode allows digital noise to be as low as possible, to ensure high precision conversion.
For these modes it is necessary to work with end of conversion interrupt, which is the
only way to wake up the chip.
If another interrupt occurs during the precision conversion, it will be treated only after
this conversion is ended.
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Note:
6 channels with multiplexed inputs
One channel with input signal average extraction and programmable gain
amplification.
10-bit cascaded potentiometric ADC
Typical conversion time 20 micro-seconds
Zero Error (offset) +/- 2 LSB max
External Positive Reference Voltage Range 2.4 to Vcc
Internal Positive Reference typical Voltage 2.4 Volt
ADCIN Range 0 to V
Integral non-linearity typical 1 LSB
Differential non-linearity typical 0.5 LSB
Conversion Complete Flag or Conversion Complete Interrupt
Selected ADC Clock
(1): See “DC Parameters for A/D Converter” on page 88.
REF
(1)
(1)
(1)
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