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MLX10407
5-Channel Gauge Driver with Serial Link
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. MLX11407CA Temperature Suffix N/A Package SO24 Temperature Range -40C to +85C Automotive
Functional Diagram
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.
MLX902xx Name of Sensor MLX10407 5-Channel Gauge Driver with Serial Link Rev Y.X 1 Page 22/Aug/98 Rev 1.1 Page 1 28/Apr/01
MLX10407
5-Channel Gauge Driver with Serial Link
DC Electrical Characteristics
Tamb = -40 to 85C, VDD = 4.5 V to 12 V unless otherwise specified.
Characteristics Supply current
Test Conditions Inputs at VDD or VSS, No loads on outputs
Symbol Min ICC
Limits Typ Max 5.5
Unit
mA
Maximum power dissipation Inputs Input capacitance Pin 11 Pull-down resistance Input voltage LOW Input voltage HIGH Hysteresis Leakage current Pin 12, 13, 14, 15, 17 Input voltage LOW Input voltage HIGH Hysteresis Leakage current (pin 12, 15, 17) Pull-down resistance (pin 14) Outputs Pin 16 Low level output voltage High level output leakage current Pin 2, 3, 5, 6, 20, 21, 23, 24 Drop-out voltage for each pair of buffers Mismatch of drop-out voltage Pin 7, 8, 9 Output voltage low Output voltage high VDD = 8.5 V pin at VDD or VSS VDD = 8.5 V pin at VDD or VSS
PDmax Cin Rpd VIL VIH VHYS IL VIL VIH VHYS IL Rpd 125 -0.3 4 0.5 -1 -0.3 4 0.5 -1 0.8
620 10 750 1 VDD+0.3 2.5 1 1 VDD+0.3 2.5 1 1.5
mW pF kOhm V V V A V V V A kOhm
IOUT < 500 A VOUT=VDD VDD = 8.5V, Tamb = 25C, Icoil = 30 mA
VOL ILKG Vd D Vd
0.3 10 1.6 50 0.3 6.8 7.8 0.6
V A V mV V V
VDD = 8.5V, Tamb= 25C, Isink = 40mA VDD = 8.5V, Tamb= 25C, Isource = 40mA
VOL VOH
Oscillator Pin 18,19 Input pin capacitance
Cin
10
20
pF
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MLX10407
5-Channel Gauge Driver with Serial Link
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Min
Value Max +150 +85 14.0 VDD +0.3
Unit
Storage Temperature Range Operating Temperature Range Supply Voltage Range Input Voltage Range
Tstg Tamb VDD Vi
-40 -40 -0.3 -0.3
C C V V
AC Electrical Characteristics
Tamb = -40 to 85C, VDD = 4.5 V to 12 V unless otherwise specified.
Characteristics
Test Conditions
Symbol Min
Limits Typ Max
Unit
Oscillator Clock frequency Serial communication Serial data clock frequency Time for DIN stable to SCLK rise Hold time for DIN Fsclk Fclk
0.95
8
8.4
MHz MHz
500 100 100
kHz ns ns
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MLX10407
5-Channel Gauge Driver with Serial Link
Typical application
Notes * The chip integrates its oscillator load capacitors. * The quartz frequency is 8MHz
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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
Conditions Test 1 Test 2 Test 3 S1 closed, S2 open S1 open, S2 closed S1 and S2 closed
Test for : V1 = VSS V1 = VDD 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
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MLX10407
5-Channel Gauge Driver with Serial Link
2) 90 logometers In addition to driving (2) 360 logometers the MLX10407 has a push-pull stage so it Is possible to drive (3) additional 90 coils connected to GND or VDD respectively.
Serial Link
The MCU outputs the serial communication clock SCLK, the chip select CS, the data DIP, and reads the ERRB error status. The data sent by the MCU is latched by the 10407 on the rising edge of SCLK. The 10407 outputs the ERRB signal on the falling edge of SCLK When CS = "0" the serial interface of the 10407 is inactive. When CS goes HIGH, the 10407 waits for a START BIT and then reads the following 15 bits transmitted by the MCU. The START BIT (D0) must be "1".
D1 0 0 0 0 1 1 1 1
D2 0 0 1 1 0 0 1 1
D3 0 1 0 1 0 1 0 1
Instruction Unused Writing request LOGO1 Unused Writing request LOGO2 Writing request LOGO3 Writing request LOGO5 Writing request LOGO4 Unused
The following 10 bits (D4, D5, D6, D7, D8, D9, D10, D11, D12, D13) set the angle value (D13 =lsb, D4 = msb). The two remaining bits (D14D15) represent the quadrant (D14=msb). Note: for Logo1 & 2 only.
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5-Channel Gauge Driver with Serial Link
Serial Link
Sclk CS Din ERRB HiZ CODOP 10 Bit Angle Quad Error
MLX10407 Serial link Protocol
The 10407 outputs an error status on pin ERRB on the falling edge of SCLK immediately following the transmission of the quadrant lsb. The pin 16 (ERRB) of the 10407 is driven low if there is no continuity between two consecutive quadrant values sent (for logo1 or logo2). The data is valid till CS is high, then when CS goes low ERRB returns to high impedance state and the error status is lost. If the MCU has detected an error, it is possible to send data again : the first data bit set to "1" will initiate a new transmission of 15 data bits. On the HIGH to LOW transition of CS the angle and quadrant values are stored into the internal registers of the 10407 if the following conditions are met: * * The MCU sent the appropriate writing request No quadrant error was detected by the 10407.
Otherwise new angle and quadrant values are discarded by the 10407 and the previous values are kept. The MCU will have to initialize a new transmission to the 10407. If VER (pin 17) is connected to VDD then the 10407 does not store values of angles and quadrant in case of an error. It is however possible to make the 10407 store all angles and quadrant values even if there is an error, by connecting VER (pin 17) to GND.
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5-Channel Gauge Driver with Serial Link
PWM Generation
1) Logometers 360 ( Logo 1 and Logo 2 ): From the angle value received from the MCU (range [0 - 89.8]), the 10407 generates two PWM signals (9 bit resolution) : * * The first one represents the sine PWMSIN, The second one is the cosine PWMCOS.
The 10407 uses a 512x9 ROM containing the sine of all angular values in the range [0 -89.8] (note that the lsb value of the angle is not used). An angle value greater than 90 is obtained using different quadrant values : * * * * Q1 (D14D15 = 00) > 0 =< a < 90 Q2 (D14D15 = 01) > 90 =< a < 180 Q3 (D14D15 = 10) > 180 =< a < 270 Q4 (D14D15 = 11) > 270 =< a < 360 a is the angle value The PWM are switched to the outputs depending on the value of the quadrant : QUADRANT D14 0 0 1 1 * * SIN1M D15 0 1 0 1 SIN1P COS1M COS1P
0 0 PWMSIN PWMCOS
PWMSIN
0
PWMCOS 0 0 PWMSIN
PWMCOS PWMSIN 0 0 PWMCOS 0
Logometer 1 is driven by outputs SIN1M/P COS1M/P, Logometer 2 is driven by outputs SIN2M/P COS2M/P.
The PWM frequency is given by : FPWM = FOSC / 512 (FOSC = Crystal oscillator frequency)
2) Logometers 90 * There are three separate PWM outputs for Logo 3, Logo 4 and Logo 5.
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5-Channel Gauge Driver with Serial Link
Pin Out
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Symbol VDD SIN1P SIN1M VSS COS1P COS1M OUT5 OUT6 OUT7 VDD CS SCLK DIN TEST RSTB ERRB VER OSCO OSCI COS2M COS2P VSS SIN2M SIN2P Description Output buffer (coil 1 Logo1) Output buffer (coil 1 Logo1) Output Output Output Output Output buffer buffer buffer buffer buffer (coil 2 Logo1) (coil 2 Logo1) (Logo 3) (Logo 4) (Logo 5)
Chip select (Schmitt trigger with 300kOhm pull-down) Serial clock (Schmitt trigger) Data IN (Schmitt trigger) TEST input.(1K pull-down) External reset (Schmitt trigger) Quadrant error output (Open drain) Quadrant verification inhibit Crystal oscillator output Crystal oscillator input Output buffer (coil 2 Logo2) Output buffer (coil 2 Logo2) Output buffer (coil 1 Logo2) Output buffer (coil 1 Logo2)
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22/Aug/98 Rev 1.1
Page 9 28/Apr/01

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