PNI ASIC - Manual

PNI ASIC
3-Axis Magneto-Inductive Sensor Driver and Controller
with SPI Serial Interface
General Description
The PNI (11096) ASIC is a low cost magnetic
Measurement Application Specific Integrated Circuit
designed for use with PNI Corporation’s magneto-
inductive sensors. The PNI ASIC can control and
measure three independent magneto-inductive
sensors. Each sensor is individually selectable for
measurement, and can also be individually
configured for measurement resolution. The PNI
ASIC has diagnostic modes and outputs to test the
oscillator and counter circuits.
The PNI ASIC contains the entire measurement
circuit, both analog and digital sections. Each sensor
changes its inductance with an applied change in
magnetic field parallel to the sensor. In order to make
a measurement, the sensor is switched into an L/R
oscillator circuit. The bipolar differential
measurement scheme used by the PNI ASIC makes
the magnetic measurement inherently temperature
independent. It also has the benefit of transforming
the measurement range into a zero centered, positive/
negative value.
Features
ƒ Low supply current:
<500 µA at 3 VDC
<1 µA, idle mode
ƒ Complete 3-axis magnetic sensor driver
ƒ Ultra-low magnetic signature in Die form
ƒ Flexible supply voltage: 2.2 to 5.0 V
ƒ Fast sample rate: up to 2000 samples/second
ƒ Wide dynamic range: 96 dB (16 bits) in
hardware with 18 dB (3 bits) additional gain
scaling available
ƒ Fully digital interface: SPI protocol
Applications
ƒ Compassing
ƒ Magnetometer instruments
ƒ Magnetic object sensing
ƒ Magnetic ink sensing
Ordering Information
Name Part # MOQ Pkg.
RoHS
Compliant
26 pad Die 10174 1,000 tray Yes
28 pin MLF 12576 5000 reel Yes
28 pin MLF 12576P 1
cut-
tape
Yes
Table 1
PNI Corporation 133 Aviation Blvd., Suite 101, Santa Rosa, CA 95403‐1084 USA Updated 27‐April‐09
Phone: (707) 566‐2260, Fax: (707) 566‐2261, Web: www.pnicorp.com