HDPM01 Datasheet, PDF (14/19 Pages) List of Unclassifed Manufacturers – Integrated pressure sensor

HDPM01
POWER CONSUMPTION
The HOPERF magnetic sensor consumes 0.4mA (typical) current at 3V with 50 measurements/second,
but the current is proportional to the measurements carried out, for example, if only 20
measurements/second are performed, the current will be 0.4*20/50=0.16mA.
I²C INTERFACE DESCRIPTION
A slave mode I²C circuit has been implemented into the HOPERF magnetic sensor as a standard
interface for customer applications. The A/D converter and MCU functionality have been added to the
HOPERF sensor, thereby increasing ease-of-use, and lowering power consumption, footprint and total
solution cost.
The I²C (or Inter IC bus) is an industry standard bi-directional two-wire interface bus. A master I2C
device can operate READ/WRITE controls to an unlimited number of devices by device addressing. The
HOPERF magnetic sensor operates only in a slave mode, i.e. only responding to calls by a master
device.
I²C BUS CHARACTERISTICS
I²C Bus
The two wires in I²C bus are called SDA (serial data line) and SCL (serial clock line). In order for a data
transfer to start, the bus has to be free, which is defined by both wires in a HIGH output state. Due to
the open-drain/pull-up resistor structure and wired Boolean “AND” operation, any device on the bus can
pull lines low and overwrite a HIGH signal. The data on the SDA line has to be stable during the HIGH
period of the SCL line. In other words, valid data can only change when the SCL line is LOW. Note:
Rp selection guide: 4.7Kohm for a short I²C bus length (less than 4inches), and 10Kohm for less than
2inches I²C bus.
Tel: [phone] Fax: [phone] E-mail: [e-mail] http://www.hoperf.com
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