Pni RM3000-F Sensor Suite Instrukcja Użytkownika Pobierz pdf (Strona 6)

PNI Sensor Corporation Doc #1016102 r04

RM3000-f & RM2000-f Sensor Suite User Manual Page 6

3 Specifications

3.1 Geomagnetic Sensor Suite Characteristics

Table 3-1: Geomagnetic Sensor Suite Performance

Parameter

Min

Typical

Max

Units

Field Measurement Range

-800

+800

Gain @ 200 Cycle Counts

@ 2.8 V

counts/ T

@ 3.3 V

counts/ T

Sensitivity @ 200 Cycle Counts

nT/LSB

Noise @ 200 Cycle Counts

Linearity - Best Fit over 200 T

0.6

1.0

% of 200 T

Max. Sample Rate per Axis @ 200 Cycle

Counts

475

Average Current per Axis @

35 Hz and 200 Cycle Counts

@ 2.8 V

0.20

@ 3.3 V

0.25

Bias Resistor (R

)

1.6 V to 2.2 V

60+(V-1.6)*67

2.2 V to 3.3 V

100

External Timing Resistor for Clock (R

EXT

)

Circuit Oscillation Frequency

195

kHz

High Speed Clock Frequency

MHz

Operating Temperature

-40

+85

Notes:

1. Specifications subject to change. Unless otherwise noted, performance characteristics assume

the user implements the recommended bias resistors and high-speed-clock timing resistor, as

given in Figure 4-1, and the 3D MagIC ASIC is operated in Standard Mode. Other bias resistors,

external timing resistors and operating voltages may be used, but performance will differ.

2. Field measurement range is defined as the monotonic region of the output characteristic curve.

Field measurement range can be extended by using different bias resistors. For example, with

an 82 Ω bias resistor the field measurement range would be ±900 µT.

3. Sensitivity is the inverse of gain, and a single “cycle count” is equivalent to the least significant bit

or “LSB”. System noise limits useable sensitivity such that above ~200 cycle counts there are

diminishing returns on useable sensitivity.

4. The maximum sample rate and gain are inversely related, so higher sample rates can be

obtained by reducing the number of cycle counts, but this also diminishes gain and sensitivity.

5. Operating at reduced cycle counts will reduce current consumption, but also diminish sensitivity.

Operating at greater cycle counts increases power consumption but, due to noise, has

diminishing returns in terms of improving sensitivity.

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