MLX10407EDF データシートの表示（PDF） - Melexis Microelectronic Systems

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MLX10407EDF

5-Channel Gauge Driver with Serial Link

Melexis Microelectronic Systems  

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

SIN1M

D15

SIN1P

COS1M COS1P

0

0

0

PWMSIN

0 PWMCOS

0

1

0 PWMCOS PWMSIN 0

1

0

PWMSIN

0 PWMCOS 0

1

1

PWMCOS

0

0

PWMSIN

• 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.

3901010407

Rev. 003

Page 8

Aug/02

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