TLE7826G Datasheet, PDF (14/53 Pages) Infineon Technologies AG – Integrated double low-side switch, high-side/LED driver, hall supply, wake-up inputs and LIN communication with embedded MCU (32kB Flash)

TLE7826G
Operating Modes
4.5.2 SBC Stop Mode
The SBC Stop Mode has the advantage of reducing the current consumption to a minimum, while supplying the
microcontroller with its quiescent current during its power saving mode (“Stop”). This mode is entered via SPI
command, and turns-off the integrated bus transceivers and respective termination, but the voltage regulator for
the microcontroller supply remains active. A microcontroller in a power saving mode has the advantage over a
turned-off microcontroller to have a reduced reaction time upon a wake-up event.
A voltage level change at the monitoring/wake-up pins will, in contrast to the behavior in Sleep Mode, generate a
signal that indicates the wake-up event at the microcontroller in Power-Down Mode. This is realized via an
interconnect from the SPI of the SBC [DO] to the microcontroller [P1.4]. In case the wake-up event was a LIN
message, the respective RxD pin of the SBC and the SPI Data Out [DO] will be pulled “low”. RxD is pulled “low”
until mode switch, while DO stays “low” for two internal SBC cycles. (The microcontroller itself has to take care of
switching SBC modes after a wake-up event notification (see Figure 7).)
Note: The window watchdog is automatically disabled once the LDO output current goes below a specified
“watchdog current threshold”, unless the SPI setting “WD On/Off” prevents this (see Figure 10, Watchdog
disable current threshold, Table 14 and “Window Watchdog Reset Period Settings” on Page 23).
Note: If the Window Watchdog was not enabled in Stop Mode the Window Watchdog starts after wake-up with a
“long open window” in SBC Standby Mode.
SBC Active Mode
MS2 MS1 MS0 Vcc
0
1 0 / 1 ON
SBC Standby Mode
Vcc
ON
Start Up
Power Up
„single“ µController SPI -Command :
- select SBC Stop Mode via SPI Mode Bits
- window watchdog activation / deactivation via SPI
[„off“ once current consumption below threshold ]
transition caused by :
- event at MONx inputs
- LIN message
[SPI indicates source]
SBC Stop Mode
MS2 MS1 MS0 Vcc
1
1
1
ON
wake event notification [to µC]:
- LIN msg. => RxD + DO („low“)
- MONx => DO („low“)
Figure 7 State Diagram “SBC Stop Mode”
Data Sheet
14
Rev. 3.01, 2008-04-15