Digi XBEE2 User Manual

Overview Electrical characteristics
XBee/XBee-PRO ZigBee RF Modules User Guide 21
Electrical characteristics
The following table provides the DC characteristics of the module.
Note The signal-ended ADC measurements are limited in their range and only guaranteed for accuracy in the
range 0 to VREFI. The nature of the ADC’s internal design allows for measurements outside of this range
(+/- 200 mV), but the accuracy of such measurements are not guaranteed.
Module operation for the Programmable variant
The S2B modules that have the programmable option populated have a secondary processor with 32k of flash
and 2k of RAM. This allows module integrators to put custom code on the XBee module to fit their own unique
needs. The DIN, DOUT, RTS, CTS, and RESET lines are intercepted by the secondary processor to allow it to be in
control of the data transmitted and received. All other lines are in parallel and can be controlled by either the
EM250 or the MC9S08QE micro; see the block diagram below for details. The EM250 by default has control of
certain lines. These lines can be released by the EM250 by sending the proper command(s) to disable the desired
DIO line(s); see Command reference tables on page 153.
Symbol Parameter Condition Min Typical Max Units
V
IL
Input Low Voltage All digital inputs
-- 0.2 * VCCV
V
IH
Input High Voltage All digital inputs
0.8 * VCC - - V
V
OL
Output Low Voltage VCC >= 2.7 V
--0.18*VCCV
V
OH
Output High Voltage VCC >= 2.7 V
0.82*VCC - - V
I
IIN
Input Leakage Current V
IN
= VCC or GND, all inputs, per pin
- - 0.5uA uA
I
OHS
Output source current
(standard)
All digital outputs except RSSI/PWM,
DIO10, DIO4
4mA
I
OHH
Output source current
(high current)
RSSI/PWM, DIO10, DIO4 digital
outputs
8mA
I
OLS
Output sink current
(standard
All digital inputs except RSSI/PWM,
DIO10, DIO4
4mA
I
OLH
Output sink current (high
current)
RSSI/PWM, DIO10, DIO4 digital
outputs
8mA
I
OH
+ I
OL
Total output current for all
I/O pins
All digital outputs
40 mA
V
REFI
VREF Internal EM250 has an internal reference that
is fixed
1.19 1.2 1.21 V
V
IADC
ADC input voltage range
0 VREFI V
R
IS
Input impedance When taking a sample
1M
R
I
Input Impedance When not taking a sample
10 M

Digi XBEE2 Specifications

General

Brand	Digi
Model	XBEE2
Category	Control Unit
Language	English