Data Sheet
Table Of Contents
- 1 FH3D02 Overview
- 2 Characteristics
- 3 Package and Circuit Connection
- 4 SPI Communication
- 5 List of Registers
- 5.1 Measurement Register Contents
- 5.1.1 0x000B (read/write) – Measurement Control
- 5.1.2 0x000E (read/write) – Measurement Start
- 5.1.3 0x0107 (read only) – Status Register
- 5.1.4 0x0110 (read only) – Temperature Sensor
- 5.1.5 0x0111 (read only) – Bi0 Magnetic Field
- 5.1.6 0x0112 (read only) – Bi1 Magnetic Field
- 5.1.7 0x0113 (read only) – Bj0 Magnetic Field
- 5.1.8 0x0114 (read only) – Bj1 Magnetic Field
- 5.1.9 0x0120 (read only) – Magnetic Field Magnitude
- 5.1.10 0x0121 (read only) – Magnetic Field Angle
- 5.1.11 0x0122 (read only) – Linearized Angle / Bz1 Field (Special Function Mode)
- 5.1.12 0x0124 (read only) – Bz0 Magnetic Field (Special Function Mode)
- 5.2 Result Register Overview
- 5.1 Measurement Register Contents
- 6 Measurement Modes
- 6.1 Single Magnetic Probe
- 6.2 Dual Magnetic Probe
- 6.3 Linear Position or Off-Axis Angle Sensor (Absolute Field Values, Magnet On-Top)
- 6.4 Linear Position or Off-Axis Angle Sensor (Gradient Field Values, Magnet On-Top)
- 6.5 Linear Position or Off-Axis Angle Sensor (Absolute Field Values, Magnet At-The-Side)
- 6.6 Linear Position or Off-Axis Angle Sensor (Gradient Field Values, Magnet At-The-Side)
- 7 Additional Features
- 8 LZE GmbH
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www.lze-innovation.de
Package and Circuit Connection
3.3
Electrical Connection
The sensor chip must be connected to a supply of 3.3V via its VDD and VSS pins. All unused pins should
be connected to VSS to guarantee proper function. A decoupling capacitor between VDD and VSS close
to the sensor chip is strongly recommended as well as the usage of non-magnetic components nearby to
prevent magnetic interference.
For communication of a single sensor with a microcontroller, all four SPI signals CS_N, SCK, MOSI and
MISO have to be connected. Fast digital signals (like clock and data signals) should be terminated with
series resistors near the transmitting device to prevent disturbing signal reflections.
It is recommended to use the two additional signals READY and RESET_N to recognize finished
measurements and execute a proper reset cycle of the sensor chip (reset timing see 5.1.2). If multiple
sensors are connected to the same lines, a pull-down resistor for the READY signal should be used.
For optional usage of low power mode or an external clock generated by the controller (see 7.1 and 7.6),
LOPOWR and CLK have to be wired properly, whereas the CLK signal also should be terminated with a
series resistor at the µC. If PMW output is used, the corresponding signal has to be wired to the receiver.
A1 M I SO
B2 M O SI
B5 SCK
A6 CS_N
C1 READ Y
C2 RESET_N
A5 LOPO W R
A2 CLK
C6 PW M
C4 VDD
C3 LOCK_N
A4 SCE
A3 V SS
B3 V SS
B4 V SS
C5 V SS
FH3D02 µC
VDD
GND
M I SO
M O SI
SCK
CS_N
READ Y
RESET_N
LOPO W R
CLK
RES5
CAP1
RES1
RES2
RES3
RES4
Recommended additional components:
CAP1: Non-magnetic capacit or near pins (100µF)
RES1: Non-magnetic series resistor matching line impedance at sensor (50Ω - 100Ω)
RES2 – RES4: Series resistor mat ching line impedance at µC (50Ω - 100Ω)
RES5: Pu l l -down resistor when using multiple sensors on same SPI bus (12kΩ)
mandatory
recommended
optional
Please note:
It is strongly recommended to use a PCB with wide bandwidth, low impedance supply layers and
impedance controlled digital signal lines with matching series resistors to the hardware setup.
A stable supply and clean signals are mandatory for low sensor noise and faultless
communication at high SPI frequency.