Product Brief
Hall-effect sensor interface provides flexibility through analog and digital outputs
3/4/2010 2:33 PM EST
The MAX9621 enables the microprocessor to monitor the status of Hall-effect sensors either through the analog output by mirroring the sensor current for linear information or through the filtered digital output. The input current threshold can be programmed for the digital output. A high-side current-sense architecture eliminates the need for a ground-return wire without introducing ground shift, thus reducing wiring cost by 50%. The MAX9621 is well suited for automotive body controllers such as window lifters.
The MAX9621 protects sensors from supply transients up to 60V and short-to-ground conditions, which enables it to withstand the harsh operating conditions in automotive applications. The device features a minimum of 50microseconds blanking time following Hall-effect sensor power-up or restart. A low-current (1microamp, typ) shutdown mode conserves power.
Available in a 3mm x 5mm, 10-pin microMAX package, the MAX9621 operates from a 5.5V to 18V supply and is fully specified over the -40°C to +125°C automotive temperature range.
Pricing: Starts at $0.87 (1000-up, FOB USA).
Availability: Now.
Datasheet: Click here.
Maxim Integrated Products, www.maxim-ic.com
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GLue
3/10/2010 6:17 PM EST
The chip is nearly OK for automotive.
There is no reserve for ESD capacitor on Hall lines. Maximum is 20nF which is still not enough to protect a Hall sensor from the motor.
The suited application for this chip are those on which hall sensor is on the same board with this driver.
An wired trough harnes motor with an integrate hall sensor will have more than 20nF only near the sensor, plus the 10 to 20nF on the application board.
If more than 40nF is used, in total, in parallel with hall sensor, filtration time after enable is not enough and some false pulses are present.
A SW solution could be implemented in this case since the number of pulses is always the same.
Also supply of the chip should be very well decoupled,in order that transient pulses from supply and the high capacitance for ESD protection will not trigger false short circuit to GND protection.
This short to ground protection is reacting to fast (<100us) and is with Latch so a new transition on Enable input is necessary.
(so new false pulses will)
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