MobileCare™ Monitor Operator’s Manual
Copyright 2008 © AFrame Digital, Inc.
39
Appendix D
— Specifications
The following are the specifications of myPHD Wireless Personal Help Watch:
myPHD Specifications
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
Operating Range
Acceleration Range
g
FS2g
-2
2
g
g
FS4g
Switchable via serial
digital interface
-4
4
g
g
FS8g
-8
8
g
Supply Voltage
(Analog)
V
DD
2.4
3.6
V
Supply Voltage for
Digital I/O
V
DDIO
VDDIO ≤VDD
1.62
3.6
Supply Current
Normal Mode
I
DD
Digital and Analog
200
290
A
Supply Current
Standby Mode
I
DDsbm
Digital and Analog
1
2
A
Operating
Temperature
T
A
-40
+85
C
Acceleration Output Signal
Acceleration Output
Format
10
Bit
Resolution
2’s complement
Sensitivity
S
2g
g-range 2g
246
256
266
LSB/g
S
4g
g-range 4g
122
128
134
LSB/g
S
8g
g-range 8g
61
64
67
LSB/g
Zero-g Offsett
Off
TA=25 , calibrated
-60
60
Mg
Zero-g Offsett
Off
TA=25 , over lifetime
-150
150
Mg
Zero-g Offset
Temperature Drift
Over TA
1
Mg/K
Bandwidth
Bw
2
nd
order analog filter
1500
Hz
Digital Filter
25, 50, 100,
190, 375,
750
Hz
Acceleration Data
Refresh Rate (all
axes)
f_rate
2700
3000
3300
Hz
Nonlinearity
NL
Best fit straight line
-0.6
0.5
FS
Table 1:
Operating range, output signal and mechanical specifications of the SMB380
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