MLX10407 Datasheet, PDF (5/9 Pages) List of Unclassifed Manufacturers – 5-Channel Gauge Driver with Serial Link

MLX10407
5-Channel Gauge Driver with Serial Link
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.
Test for short and open circuits
Test 1
Test 2
Test 3
Conditions
Test for :
S1 closed, S2 open V1 = VSS
S1 open, S2 closed V1 = VDD
S1 and S2 closed V1 = VDD/2
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 : Vd = | VCC - Vcoil |
One Bridge
MLLXX910024x0x7Na5m-Cehoaf nSneenlsGorauge Driver with Serial LinkRePvaYg.Xe 5
22/Aug/98 Rev 1.1 2P8a/Agper5/01