AT91M55800-33CI Atmel, AT91M55800-33CI Datasheet - Page 12

• Manufacturer Part Number: AT91M55800-33CI
• Description: IC ARM7 MCU 176 BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91M55800-33CI

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 58
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 176-LFBGA
• For Use With: AT91EB55 - KIT EVAL FOR ARM AT91M55800A
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: AT91M5580033CI

Product Overview
Power Supplies
Input/Output
Considerations
12
AT91M55800A
The AT91M55800A has 5 kinds of power supply pins:
•
•
•
•
•
VDDIO and VDDCORE are separated to permit the I/O lines to be powered with 5V,
thus resulting in full TTL compliance.
The following ground pins are provided:
•
•
•
•
All of these ground pins must be connected to the same voltage (generally the board
electric ground) with wires as short as possible. GNDPLL, GNDA and GNDBU are pro-
vided separately in order to allow the user to add a decoupling capacitor directly
between the power and ground pads. In the same way, the PLL filter resistor and capac-
itors must be connected to the device and to GNDBU with wires as short as possible.
Also, the external load capacitances of the main oscillator crystal and the 32768 Hz
crystal must be connected respectively to GNDPLL and to GNDBU with wires as short
as possible.
The main constraints applying to the different voltages of the device are:
•
•
•
The nominal power combinations supported by the AT91M55800A are described in the
following table:
Table 5. Nominal Power Combinations
After the reset, the peripheral I/Os are initialized as inputs to provide the user with maxi-
mum flexibility. It is recommended that in any application phase, the inputs to the
AT91M55800A microcontroller be held at valid logic levels to minimize the power
consumption.
VDDIO
3.3V
VDDCORE pins, which power the chip core
VDDIO pins, which power the I/O Lines
VDDPLL pins, which power the oscillator and PLL cells
VDDA pins, which power the analog peripherals ADC and DAC
VDDBU pins, which power the RTC, the 32768 Hz oscillator and the Shut-down
Logic of the APMC
GND for both VDDCORE and VDDIO
GNDPLL for VDDPLL
GNDA for VDDA
GNDBU for VDDBU
VDDBU must be lower than or equal to VDDCORE
VDDA must be higher than or equal to VDDCORE
VDDCORE must be lower than or equal to VDDIO
3V
5V
VDDCOR
3.3V
3.3V
3V
E
VDDA
3.3V
3.3V
3V
VDDPLL
3.3V
3.3V
3V
VDDBU
3.3V
3.3V
3V
Maximum Operating
Frequency
33 MHz
33 MHz
33 MHz
1745CS–ATARM–05/02