MLX902xx Name of Sensor
Rev Y.X
22/Aug/98
Page 1
3901010407
Page 1
Aug/02
Rev. 003
Features and Benefits
Supply voltage up to 12 V
Interface directly with 5 V CMOS logic MCUs
Serial link
Can drive two 360 actuators & three 90 actuators simultaneously
Open circuit / short-circuit detection of the drivers outputs
Small size (SO24 package)
Real Time Angle Tracking
Applications
Logometer Driver Dashboard
Industrial Metering
Ordering Information
Part No.
Temperature Suffix
Package
Option Code
MLX10407
E (-40C to 85C)
DF (SOIC24)
CA
Description
The 10407 is a MCU peripheral for logometers control using SIN/COS PWM commands. The circuit controls two
independent sets of CMOS power bridges. A ten-bit angle is displayed with a 9 bit per quadrant resolution PWM whose
frequency is set by a crystal oscillator. A power-on self test detects open or short-circuit outputs for each logometer and
a real time angle tracking avoids display errors.
The 10407 can also drive three small angle logometers (90). A three wire serial link allows bidirectional communication
with the MCU.
Functional Diagram
3901010407
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Rev. 003
Characteristics
Test Conditions
Symbol
Limits
Unit
Min
Typ
Max
Supply current
Inputs at VDD or
VSS, No loads on
outputs
ICC
5.5
mA
Maximum power dissipation
PDmax
620
mW
Inputs
Input capacitance
Cin
10
pF
Pin 11
Pull-down resistance
Rpd
125
750
kOhm
Input voltage LOW
VIL
-0.3
1
V
Input voltage HIGH
VIH
4
VDD+0.3
V
Hysteresis
VDD = 8.5 V
VHYS
0.5
2.5
V
Leakage current
pin at VDD or VSS
IL
-1
1
A
Pin 12, 13, 14, 15, 17
Input voltage LOW
VIL
-0.3
1
V
Input voltage HIGH
VIH
4
VDD+0.3
V
Hysteresis
VDD = 8.5 V
VHYS
0.5
2.5
V
Leakage current (pin 12, 15, 17)
pin at VDD or VSS
IL
-1
1
A
Pull-down resistance (pin 14)
Rpd
0.8
1.5
kOhm
Pin 16
Low level output voltage
IOUT < 500 A
VOL
0.3
V
High level output leakage current
VOUT=VDD
ILKG
10
A
Pin 2, 3, 5, 6, 20, 21, 23, 24
Drop-out voltage for each pair of
buffers
VDD = 8.5V, Tamb =
25C, Icoil = 30 mA
Vd
1.6
V
Mismatch of drop-out voltage
D Vd
50
mV
Pin 7, 8, 9
Output voltage low
VDD = 8.5V, Tamb=
25C, Isink = 40mA
VOL
0.3
0.6
V
Output voltage high
VDD = 8.5V, Tamb=
25C, Isource =
40mA
VOH
6.8
7.8
V
Oscillator
Pin 18,19
Input pin capacitance
Cin
10
20
pF
Outputs
DC Electrical Characteristics
Tamb = -40 to 85C, VDD = 4.5 V to 12 V unless otherwise specified.
MLX902xx Name of Sensor
Rev Y.X
22/Aug/98
Page 3
3901010407
Page 3
Aug/02
Rev. 003
Parameter
Symbol
Unit
Min
Max
Storage Temperature Range
Tstg
-40
+150
C
Operating Temperature Range
Tamb
-40
+85
C
Supply Voltage Range
VDD
-0.3
14.0
V
Input Voltage Range
Vi
-0.3
VDD +0.3
V
Value
ABSOLUTE MAXIMUM RATINGS
AC Electrical Characteristics
Tamb = -40 to 85C, VDD = 4.5 V to 12 V unless otherwise specified.
Characteristics
Test Conditions
Symbol
Unit
Min
Typ
Max
Oscillator
0
.
95
8.4
MHz
Clock frequency
Fclk
8
MHz
Serial communication
Serial data clock frequency
Fsclk
500
kHz
Time for DIN stable to SCLK rise
100
ns
Hold time for DIN
100
ns
Limits
MLX902xx Name of Sensor
Rev Y.X
22/Aug/98
Page 5
3901010407
Page 5
Aug/02
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.
Conditions
Test for :
Test 1
S1 closed, S2 open
V1 = VSS
Test 2
S1 open, S2 closed
V1 = VDD
Test 3
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 : V
d
= | V
CC
- V
coil
|
Test for short and open circuits
One Bridge
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