User Manual

XBee®/XBee‐PRO®RFModules‐802.15.4‐v1.xEx[2011.06.1]
©2011DigiInternatonal,Inc. 10
Electrical Characteristics
Table1‐03. DCCharacteristics(VCC=2.8‐3.4VDC)
Symbol Characteristic Condition Min Typical Max Unit
V
IL
Input Low Voltage All Digital Inputs - - 0.35 * VCC V
V
IH
Input High Voltage All Digital Inputs 0.7 * VCC - - V
V
OL
Output Low Voltage
I
OL
= 2 mA, VCC >= 2.7 V
--0.5V
V
OH
Output High Voltage
I
OH
= -2 mA, VCC >= 2.7 V
VCC - 0.5 - - V
II
IN
Input Leakage Current
V
IN
= VCC or GND, all inputs, per pin
- 0.025 1 µA
II
OZ
High Impedance Leakage Current
V
IN
= VCC or GND, all I/O High-Z, per pin
- 0.025 1 µA
TX Transmit Current VCC = 3.3 V -
45
(XBee)
215, 140
(PRO,
Int)
-mA
RX Receive Current VCC = 3.3 V -
50
(XBee)
55
(PRO)
-mA
PWR-DWN Power-down Current SM parameter = 1 - < 10 - µA
Table1‐04. ADCCharacteristics(Operating)
Symbol Characteristic Condition Min Typical Max Unit
V
REFH
VREF - Analog-to-Digital converter
reference range
2.08 -
V
DDAD*
V
I
REF
VREF - Reference Supply Current
Enabled - 200 - µA
Disabled or Sleep Mode - < 0.01 0.02 µA
V
INDC
Analog Input Voltage
1
1. Maximumelectricaloperatingrange,notvalidconversionrange.
*V
DDAD
isconnectedtoVCC.
V
SSAD
- 0.3
-
V
DDAD
+ 0.3
V
Table1‐05. ADCTiming/PerformanceCharacteristics
1
1. AllACCURACYnumbersarebasedonprocessorandsys tembeinginWAITstate(verylittleactivityandnoIOswitching)
andthatadequatelow‐passfilteringispresentonanaloginputpins(filterwith0.01μFto0.1μFcapac itorbetweenanalog
inputandVREFL).Failuretoobservetheseguidelinesmay
resultinsystemormicrocontrollernoisecausingaccuracyerrors
whichwillvarybasedonboardlayoutandthetypeandmagnitudeoftheactivity.
Datatransmissionandreceptionduringdataconversionmaycausesomedegradationofthesespecifications,dependingon
thenumberandtimingofpackets.Itisadvisabletotest
theADCsinyourinstallationifbestaccuracyisrequired.
Symbol Characteristic Condition Min Typical Max Unit
R
AS
Source Impedance at Input
2
2. R
AS
istherealportionoftheimpedanceofthenetworkdrivingtheanaloginputpin.Valuesgreaterthanthisamountmay
notfullychargetheinputcircuitryoftheATDresultinginaccuracyerror.
--
10
k
V
AIN
Analog Input Voltage
3
3. AnaloginputmustbebetweenV
REFL
andV
REFH
forvalidconversion.ValuesgreaterthanV
REFH
willconvertto$3FF.
V
REFL
V
REFH
V
RES
Ideal Resolution (1 LSB)
4
4. Theresolutionistheidealstepsizeor1LSB=(V
REFH
–V
REFL
)/1024
2.08V <
V
DDAD
< 3.6V
2.031 - 3.516 mV
DNL
Differential Non-linearity
5
5. Differentialnon‐linearityisthedifferencebetweenthecurrentcodewidthandtheidealcodewidth(1LSB).Thecurrent
codewidthisthedifferenceinthetransitionvoltagestoandfromthecurrentcod e.
- ±0.5 ±1.0 LSB
INL
Integral Non-linearity
6
6. Integralnon‐linearityisthedifferencebetweenthetransitionvoltagetothecurrentcodeandtheadjustedidealtransition
voltageforthecurrentcode.Theadjustedidealtransitionvoltageis(CurrentCode–1/2)*(1/((V
REFH
+E
FS
)–(V
REFL
+E
ZS
))).
- ±0.5 ±1.0 LSB
E
ZS
Zero-scale Error
7
7. Zero‐scaleerroristhedifferencebetweenthetransitiontothefirstvalidcodeandtheidealtransitiontothatcode.The
Idealtransitionvoltagetoagivencodeis(Code–1/2)*(1/(V
REFH
–V
REFL
)).
- ±0.4 ±1.0 LSB
F
FS
Full-scale Error
8
8. Full‐scaleerroristhedifferencebetweenthetransitiontothelastvalidcodeandtheidealtransitiontothatcode.Theideal
transitionvoltagetoagivencodeis(Code–1/2)*(1/(V
REFH
–V
REFL
)).
- ±0.4 ±1.0 LSB
E
IL
Input Leakage Error
9
9. Inputleakageerroriserrorduetoinputleakageacrosstherealportionoftheimpedanceofthenetworkdrivingtheanalog
pin.Reducingtheimpedanceofthenetworkreducesthiserror.
- ±0.05 ±5.0 LSB
E
TU
Total Unadjusted Error
10
- ±1.1 ±2.5 LSB