BTS 6480SF Infineon Technologies, BTS 6480SF Datasheet - Page 50

• Manufacturer Part Number: BTS 6480SF
• Manufacturer: Infineon Technologies

Specifications of BTS 6480SF

• Packages: PG-DSO-36
• Channels: 4.0
• Channel Mix: 2*4,5mohm+2*11mohm
• Led Mode: Yes
• Cranking Mode: No
• Pwm Engine Integrated: Yes

9.4
The SPOC - BTS6480SF refers all the channel activations to the clock signal
external clock
processing.
In case of micro controller’s loss of the PCLK synchrony the automatic PWM generation can be started again by
resetting and setting of the bit PCR.PST. After that the micro controller is synchronous to the automatic PWM
generation.
9.5
The device provides for current sense measurements a function, which changes the current sense multiplexer
sequentially and automatically. The function starts after the PWM reference point has passed, which happens
each 1024 clock cycles (
multiplexer is switched first to the channel 0. When the current sense synchronization signal at the pin ISSY is
finished, the multiplexer is programmed automatically to channel 1 (one clock cycle after the high low transition of
the ISSY signal) and so on. The current sense synchronization signal at the pin ISSY will be set for eight clock
cycles, if the channel duty cycle is 0 % <
= 100 %) or off (
synchronization signal will be set for nine clock cycles (
for channels continuously in ON- or OFF-state, the ISSY signal will be started 11 clock cycles after the previous
ISSY pulse.
If the synchronization delay is programmed to 11
This multiplexer switching loop is done only once after the bit DCR.AMUX is set. After the completed loop the bit
will be set to DCR.AMUX = 0
The automatic multiplexer switching can be stopped manually by setting the bit DCR.AMUX = 0
Note: The phase shifts between the channels have to be programmed in ascending order (channel 0 with minimum
Data Sheet
= 01
phase shift, channel 1 with a higher phase shift than channel 0, channel 2 with a higher phase shift than
channel 1, ...) to get a short AMUX burst duration. Otherwise the duration for a complete automatic
multiplexer cycle will increase until a new PWM reference point has passed and the channel is activated.
During the activated AMUX bit any command, which should change the multiplexer, will be ignored. If a
channel is switched continuously off, the current sense multiplexer will be switched to high impedance during
the sense synchronization pulse.
b
, otherwise the next ISSY signal will be delayed by one period of the following channel.
Sense Measurement without Synchronization Signal
Automatic Current Sense Multiplexer Switching
f
PCLK
DC
the state (ON- or OFF-state) is known by the micro controller, which allows a time based
= 0 %), or the
f
PCLK
b
automatically. For more details please refer to
or
f
INT
). For more details please refer to figure
t
DC
ISSY delay
<100 %. For the scenario, where the channel is continuously on (
b
>
the following channel needs at minimum a synchronization delay
t
duty cycle
f
PCLK
50
or
(delay longer than on-state of channel) the sense
f
INT
). Furthermore, to shorten the ISSY burst length
Figure
f
PCLK
Figure
or
24.
SPOC - BTS6480SF
f
INT
24. The current sense
. In case of using the
Rev. 1.0, 2010-04-12
b
.
Diagnosis
DC