mlx10407 Melexis Company, mlx10407 Datasheet - Page 5

• Manufacturer Part Number: mlx10407
• Description: Five-channel Gauge Driver W/ Serial Link
• Manufacturer: Melexis Company

MLX902xx Name of Sensor
3901010407
Rev. 003
Operation
1) 360° logometers
Immediately following a reset, the IC checks if there is any short-circuit or open circuit on each
buffer driver output (This test is not performed for outputs 5, 6 and 7). During this test, each buffer
is held in a high impedance state and large value internal resistors (100kOhm ) are sequentially
connected on each pair of buffers (note : actuator coils must be connected on bridges).
Three tests are performed according to the following figure and table.
During the tests the pin ERRB (16) is at logic level 0. After completing the tests, ERRB remains
low if one (or more) test failed.
ERRB returns to high impedance if everything is OK.
These tests last approximately 4 ms with an oscillator clock frequency of 8 MHz.
After testing, all buffers are at VSS. The chip then waits for the MCU to send an angle/quadrant
value to output the PWM signals for each buffer. Every logometer coil is connected in a bridge,
so the current Icoil can be either positive or negative.
The total drop-out of a bridge is : V
Test for short and open circuits
One Bridge
d
= | V
CC
Rev Y.X
- V
Page 5
coil
|
Test 1
Test 2
Test 3
S1 closed, S2 open
S1 open, S2 closed
S1 and S2 closed
Conditions
22/Aug/98
V1 = VDD/2
V1 = VDD
V1 = VSS
Test for :
Page 5
Aug/02