BTS6460SF INFINEON [Infineon Technologies AG], BTS6460SF Datasheet - Page 26

• Manufacturer Part Number: BTS6460SF
• Description: SPI Power Controller
• Manufacturer: INFINEON [Infineon Technologies AG]

7
The SPOC - BTS6460SF has an automatic PWM generator implemented, which allows to operate the channels
in PWM mode with drastically reduced micro controller attention compared to a conventional PWM generation via
SPI. After the initializing phase, where different settings are done, the PWM generator works autonomously. The
only required information from the micro controller is the PWM duty cycle and the channel states (ON-state or
OFF-state).
For details about the current sense diagnosis please refer to
7.1
The PWM operation mode is available for each output. The register CHCRn.FREQ is used to switch from normal
mode to automatic PWM generation mode. With CHCRn.FREQ = 00
register value. For details please refer to
To start the automatic PWM generation the bit PCR.PST has to be set. For details please refer to
The device can be woken up also out of stand-by mode by setting the bit PCR.PST. Therefore, the power-on wake
up time
7.2
The output PWM frequency
from an internal clock
Note: For avoiding skews it is recommended to change from external to internal clock source or vice versa only
7.2.1
The output PWM frequency is generated from the PWM clock input signal
HWCR.CLK is set to 0
The prescaler is set via the register CHCRn.FREQ according to:
Table 3
For example: with
•
•
•
Note: For avoiding skews it is recommended to change the prescaler setting only during deactivated PWM
Data Sheet
f
Prescaler Setting
CHCRn.FREQ
00
01
10
11
PWM
b
b
b
b
CHCRn.FREQ = 01
CHCRn.FREQ = 10
CHCRn.FREQ = 11
during deactivated PWM generator (PCR.PST = 0
generator (PCR.PST = 0
=
t
WU(PO)
------------------------------------- -
256 prescaler
Automatic PWM Generator
PWM Setup
PWM Clock
External PWM Clock
Prescaler Setting
f
PCLK
(5.3.14) has to be considered as delay until the automatic PWM generation will start.
f
in
=102,400 Hz
b
. The resulting output PWM frequency clock
f
INT
b
b
b
:
:
:
. The source for the PWM clock can be selected by the SPI register HWCR.CLK.
f
f
f
f
PWM
PWM
PWM
PWM
Resulting Prescaler
Normal mode without automatic PWM generation
Prescaler 1:
Prescaler 2:
Prescaler 4:
b
= 400 Hz
= 200 Hz
= 100 Hz
).
can be derived from an external clock
Figure
f
f
f
PCLK
PCLK
PCLK
5.
(or
(or
(or
f
f
f
INT
INT
INT
26
) / 256
) / 512
) / 1024
b
).
Chapter
f
PWM
9.
b
f
is:
PCLK
the output state is following the OUTn
, which is applied at the pin PCLK, or
f
PCLK
(applied at the pin PCLK), if
Automatic PWM Generator
SPOC - BTS6460SF
Rev. 1.0, 2010-04-12
Figure
8.
(1)