Pni ASIC User Manual

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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
Low supply current:
<500 µA at 3 VDC
<1 µA, idle mode
Complete 3-axis magnetic sensor driver
Ultra-low magnetic signature in Die form
Flexible supply voltage: 2.2 to 5.0 V
Fast sample rate: up to 2000 samples/second
Wide dynamic range: 96 dB (16 bits) in
hardware with 18 dB (3 bits) additional gain
scaling available
Fully digital interface: SPI protocol
Applications
Compassing
Magnetometer instruments
Magnetic object sensing
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
PNICorporation133AviationBlvd.,Suite101,SantaRosa,CA954031084USAUpdated27April09
Phone:(707)5662260,Fax:(707)5662261,Web:www.pnicorp.com
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Summary of Contents

Page 1 - PNI ASIC

 PNI ASIC 3-Axis Magneto-Inductive Sensor Driver and Controller with SPI Serial Interface General Description The PNI (11096) ASIC is a low cost ma

Page 2 - SPECIFICATIONS

PNIASICHostProcessorInterface Figure 5: SPI Port Full Timing Sequence (cpol = 0 ) Figure 6: SPI Port Timing Parameters (cpol = 0)

Page 3 - Electrical Specifications

PNIASICHostProcessorInterface Idle Mode The PNI ASIC does not initialize in the idle mode at power-up. The PNI ASIC must be in a data-ready sta

Page 4 - Theory of Operation

PNIASICHostProcessorInterface PS0, PS1, and PS2 – Period Select Selects the division ratio applied to the L/R oscillator output to set the peri

Page 5

PNIASICHostProcessorInterface Response Word PNI ASIC will return the result of a complete forward and reverse bias measurement of the sensor in

Page 6 - CONNECTIONS

PNIASICPackageInformation Package Information Pin Configuration Figure 7: Pin Configuration PNICorporation133AviationBlvd.,Suite

Page 7 - Host Processor Interface

PNIASICPackageInformation 28 Lead MLF (5 x 5 mm) Outline Dimensions Figure 8: 28 Lead MLF (5 x 5 mm) Outline Dimensions PNICorporation133

Page 8 - SPI Port Line Descriptions

PNIASICPackageInformation 28 Lead MLF (5 x 5 mm) Tape & Reel Dimensions Figure 9: 28 Lead MLF (5 x 5 mm) Tape & Reel Dimensions PNIC

Page 9 - Operation

PNIASICPackageInformation Die Package Mechanical Specifications Die size is 2580 µm x 2360 µm (with scribe line). All X and Y coordinates refer t

Page 10 - SPI Port Usage Tips

PNIASICPackageInformation Die Package Mechanical Specifications Table 13: Die Pad Descriptions Pad Function X (mm) Y (mm) 1 VSTBY –655 96

Page 11 - Command Byte

Recommended Processing Parameters Figure 11: Lead Free Reflow Profile Table 14 Recommended Processing Parametersa Reflow Parameter Temperature

Page 12

PNIASICSpecifications SPECIFICATIONS CAUTION: Stresses beyond those listed under Table 2 may cause permanent damage to the device. These are s

Page 13 - Response Word

PNIASICSpecifications Electrical Specifications Parameter voltage and current levels Testing for the currents listed in Table 4 assume a static t

Page 14 - Package Information

PNIASICTheoryofOperation Theory of Operation The PNI ASIC contains the entire measurement circuitry necessary to use PNI Corporation’s magneto-

Page 15

PNIASICTheoryofOperation Figure 2: Forward Bias versus Reverse Bias illustrates the change between these two measurements. The actual magnetic m

Page 16

PNIASICTheoryofOperation CONNECTIONS A typical connection configuration is shown in Figure 4 with the analog and digital sections of the PNI ASI

Page 17

PNIASICHostProcessorInterface Host Processor Interface All accesses to and from the PNI ASIC are through a hardware handshaking, synchronous se

Page 18

PNIASICHostProcessorInterface SPI Port Line Descriptions MOSI – Master Out Slave In The data sent from the master to the PNI ASIC. Data is tran

Page 19 - ‐19‐

PNIASICHostProcessorInterface Hardware Handshaking Line Descriptions RESET RESET is usually low. RESET must be toggled from low-high-low. DRDY –

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