M55800A Atmel Corporation, M55800A Datasheet - Page 224

• Manufacturer Part Number: M55800A
• Manufacturer: Atmel Corporation

Specifications of M55800A

• Flash (kbytes): 0 Kbytes
• Pin Count: 176
• Max. Operating Frequency: 33 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 58
• Ext Interrupts: 58
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 3
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 72
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.3/5.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

22. DAC: Digital-to-Analog Converter
22.1
224
Conversion Details
AT91M5880A
The AT91M55800A features two identical 1-channel 10-bit Digital-to-analog converters (DAC).
Each DAC has an analog output pin (DA0 and DA1) and provides an interrupt signal to the AIC
(DA0IRQ and DA1IRQ). Both DACs share the analog power supply pins VDDA and GNDA, and
the input reference pin DAVREF.
Table 22-1.
Figure 22-1. DAC Block Diagram
Digital-to-analog conversions are possible only if the DAC has been enabled in the APMC and
the startup time has elapsed. This startup time is a maximum of 5 µsec, and is indicated more
precisely in the Electrical Characteristics datasheet of the device as parameter t
Digital inputs are converted to output voltages on a linear conversion between 0 and DAVREF.
The analog output voltages on DA0 and DA1 pins are determined by the following equation:
Advanced
Peripheral
Bus
Pin Name
VDDA
GNDA
DAVREF
DA0
DA1
TIOA0....TIOA5
DAnIRQ
Data Holding
Register
Data Output
Register
Trigger Selection
Control Logic
Meaning
Analog power supply
Analog ground
Reference voltage
Analog output, channel 0
Analog output, channel 1
10-bit DAC
+
-
1745F–ATARM–06-Sep-07
DASU
VDDA
GNDA
DAn
DAVREF
.