Philips Semiconductors KMI16/1 Product Information

General Description

The KMI16/1 is an integrated rotational speed sensor designed to detect the rotational speed of ferrous gear wheels and reference marks. It features a magnetoresistive sensor element, a signal conditioning integrated circuit in bipolar technology, and a ferrite magnet. The digital current output signal frequency is proportional to the rotational speed of the target wheel, making it suitable for various applications requiring precise speed measurement.

Key Features

• Magnetoresistive Sensor Element: Detects motion of ferrous gear wheels.
• Signal Conditioning IC: Provides temperature compensation and amplification.
• Ferrite Magnet: Ensures reliable magnetic field generation.
• Open Collector Output: Offers flexibility in subsequent conditioning electronics.
• Wide Operating Voltage Range: 4.5V to 16V.
• High Sensing Distance: Up to 2.9mm.
• Wide Operating Temperature Range: -40°C to +150°C.

Applications

• Automotive: For speed sensors in vehicles.
• Industrial Automation: For monitoring rotational speed in machinery.
• Telecommunications: For speed control in communication equipment.

Pin Descriptions

TableCopy

Electrical Characteristics

DC Supply Voltage (Vcc)

• Min: 4.5V
• Typ: 5V
• Max: 16V

DC Supply Current (Icc)

• Min: 4mA
• Typ: 10mA
• Max: 14mA

OC Saturation Voltage (VcEsat)

• Min: 1V
• Typ: 1V
• Max: 1V

Maximum Sensing Distance (dmax)

• Min: 2.4mm
• Typ: 2.9mm
• Max: 3mm

Operating Tooth Frequency (ft)

• Min: 0Hz
• Typ: 1kHz
• Max: 25kHz

Ambient Operating Temperature (Tamb)

• Min: -40°C
• Typ: 25°C
• Max: +150°C

Limiting Values

DC Operating Supply Voltage (Vcc)

• Min: 4.5V
• Max: 16V

OC Output Voltage (Vout)

• Min: -0.5V
• Max: +16V

Peak OC Output Voltage (Vout(max))

• Min: -0.5V
• Max: +26.5V

OC Output Current (lout(max))

• Min: 1mA
• Max: 20mA

OC Output Leakage Current (lout(off))

• Min: 1μA
• Max: 100μA

Total Power Dissipation (Ptot)

• Min: 1mW
• Max: 200mW

Soldering Temperature (Tsld)

• Min: 1°C
• Max: 260°C

Storage Temperature (Tstg)

• Min: -65°C
• Max: +150°C

Characteristics

Supply Current (Icc)

• Min: 4mA
• Typ: 10mA
• Max: 14mA

OC Output Voltage High (Vout (high))

• Min: 4.7V
• Typ: 4.9V
• Max: 5V

OC Saturation Voltage (VcEsat)

• Min: 1V
• Typ: 0.4V
• Max: 1V

Output Signal Rise Time (tr)

• Min: 5μs
• Typ: 12μs
• Max: 20μs

Output Signal Fall Time (tf)

• Min: 0.1μs
• Typ: 0.4μs
• Max: 10μs

Duty Cycle (δ)

• Min: 30%
• Typ: 50%
• Max: 70%

Minimum Sensing Distance (dmin)

• Min: 1mm
• Typ: 0.3mm
• Max: 0.5mm

Maximum Sensing Distance (dmax)

• Min: 2.4mm
• Typ: 2.9mm
• Max: 3mm

Functional Description

The KMI16/1 sensor detects the motion of ferrous gear wheels or reference marks. The functional principle involves flux bending, where different directions of magnetic field lines in the magnetoresistive sensor element cause an electrical signal. The sensor is sensitive to movement in the 'y' direction only. The signal is amplified, temperature compensated, and passed to a Schmitt trigger in the conditioning integrated circuit. The digital output signal level is independent of the sensing distance within the measuring range.

Mounting Conditions

The recommended sensor position in front of a gear wheel is shown in Fig.11. The distance 'd' is measured between the sensor front and the tip of a gear wheel tooth. The sensor is sensitive to movement in the 'y' direction only. Incorrect mounting positions can affect the sensing distance.

Environmental Conditions

The sensing distance depends on the tooth frequency due to eddy current effects. The influence of the gear wheel module on the sensing distance is shown in Fig.12.

Package Outline

• Package Type: Plastic single-ended multi-chip package with a magnetized ferrite magnet (8x8x4.5mm)
• Interconnections: 4 connections, 3 in-line leads

Ordering Information

• Part Number: KMI16/1
• Status: Production
• Package: SOT477B