TLE9260-3QX Datasheet, PDF (83/175 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9260-3QX
Wake and Voltage Monitoring Inputs
10.2
Functional Description
The wake input pins are edge-sensitive inputs with a switching threshold of typically 3V. This means that both
transitions, HIGH to LOW and LOW to HIGH, result in a signalization by the SBC. The signalization occurs either
in triggering the interrupt in SBC Normal Mode and SBC Stop Mode or by a wake up of the device in SBC Sleep
and SBC Fail-Safe Mode.
Two different wake detection modes can be selected via SPI:
• Static sense: WK inputs are always active
• Cyclic sense: WK inputs are only active for a certain time period (see Chapter 5.2.1)
Two different filter times of 16µs or 64µs can be selected to avoid a parasitic wake-up due to transients or EMC
disturbances in static sense configuration.
The filter time (t_FWK1, t_FWK2) is triggered by a level change crossing the switching threshold and a wake signal is
recognized if the input level will not cross again the threshold during the selected filter time.
Figure 31 shows a typical wake-up timing and parasitic filter.
V_WK
V_WK,th
V_WK,th
V_INT
t
t_WK,f
t_WK,f
No Wake Event
tINT
t
Wake Event
Figure 31 Wake-up Filter Timing for Static Sense
The wake-up capability for each WK pin can be enabled or disabled via SPI command in the WK_CTRL_2
register.
The wake source for a wake via a WKx pin can always be read in the register WK_STAT_1 at the bits WK1_WU,
WK2_WU, and WK3_WU.
The actual voltage level of the WK pin (LOW or HIGH) can always be read in SBC Normal and SBC Stop Mode
in the register WK_LVL_STAT. During Cyclic Sense, the register show the sampled levels of the respective WK
pin.
If FO2...3 are configured as WK inputs in its alternative function (16µs static filter time), then the wake events will
be signalled in the register WK_STAT_2.
Data Sheet
83
Rev. 1.1, 2014-09-26