User Manual

RF220SU
Pin
Pin Name
SNAPpy
IO
ATmega128RFA1 Pin
Name
Pin Description
19 GPIO17 30 PF6_ADC6_TDO
IO or Analog6 or JTAG Test Data
Out or software I
2
C SDA
20 GPIO18 31 PF7_ADC7_TDI
IO or Analog7 or JTAG Test Data
In or software I
2
C SCL
21 VCC VCC Power Supply
22 GPIO19 19 PE3_OC3A_AIN1
IO or Analog Comparator or PWM
or Output Compare Match
23 RESET# RESET# Module Reset, Active Low
24 GND GND Power Supply
Electrical Characteristics
Unless otherwise specified in this document, all electrical characteristics conform to the Atmel ATmega 128RFA1
microcontroller. Detailed specifications on all electrical characteristics are available on the Atmel website at
http://www.atmel.com/
Symbol Parameter Condition Min Typ Max Units
V
CC
1
Supply Voltage 2.0 3.3 3.6 V
Table 3: RF220SU DC Characteristics at 25° C
Symbol Parameter Condition Min Typical Max Unit
V
REFH
2
ADC Voltage Reference, High Programmable 1.5 1.6 1.8 V
V
INDC
Analog input voltage
Single Ended 0 1.8
V
Differential
3
0 3.3
Table 4: ADC Electrical Characteristics (Operating)
1 Absolute maximum stress rated voltage for VCC is -0.3 to 3.6. It is recommended that bulk capacitance be located as close as possible
to the VCC pin on the host board. Ideally, use a single 47µF capacitor rated at 10V directly at the VCC pin.
2 VREFH is programmable to three fixed values; 1.5V, 1.6V, and 1.8V. The VREFH value will be 1.6 volts if you do not explicitly adjust it
by poking the ATmega128RFA1 registers.
3 Each differential analog input may be as high as 3.3V but the single-ended voltage is still limited to the voltage reference.