TLE5012_10 Datasheet, PDF (51/64 Pages) Infineon Technologies AG – GMR-Based Angular Sensor for Rotor-Position Sensing

TLE5012
Specifications
3.5.2 Pulse-Width Modulation Interface
The Pulse-Width Modulation (PWM) Interface can be selected via SPI.
The PWM update rate can be changed within the register 0E_H (IFAB_RES) in following steps:
• 0.25 kHz with 12-bit resolution
• 0.5 kHz with 12-bit resolution
• 1.0 kHz with 12-bit resolution
• 2.0 kHz with 12-bit resolution
PWM uses a square wave with constant frequency whose duty cycle is modulated, resulting in an average value
of the waveform.
Figure 22 shows the principal behavior of a PWM with various duty cycles and the definition of timing values. The
duty cycle of a PWM is defined by following general formulas:
Duty Cycle = ^ton
t _PWM
t_PWM = t_on + t_off
f _PWM
=¹
t _PWM
(6)
The range between 0 - 6.25% and 93.75 - 100% is used only for diagnostic purposes. More details are given in
Table 22.
U_IFA
Vdd
ON = High level
OFF = Low level
t_PWM
t_OFF
t_ON
Duty cycle = 5%
U_IFA^‚0'
Vdd
Duty cycle = 50%
t
U_IFA ^‚0'
Vdd
Duty cycle = 95%
t
‚0'
Figure 22 Typical Example for a PWM Signal
Table 22 PWM Interface
Parameter
PWM output frequency
Symbol
f_PWM
Min.
244
Values
Typ. Max.
-
1953
t
Unit Note / Test Condition
Hz
selectable by IFAB_RES¹⁾²⁾
Final Data Sheet
51
V 1.0, 2010-11