TLE9261-3QX Datasheet, PDF (113/186 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9261-3QX
Supervision Functions
VCC1
V_RTx
t
t_RF
t_RD1
RO
SBC Normal
SBC Restart
Figure 52 VCC1 Under Voltage Timing Diagram
t
SBC Normal
An additional safety mechanism is implemented to avoid repetitive VCC1 under voltage resets due to high dynamic
loads on VCC1:
• A counter is increased for every consecutive VCC1 under voltage event (regardless on the selected reset
threshold),
• The counter is active in SBC Init-, Normal-, and Stop Mode,
• For VS < V_S,UV the counter will be stopped in SBC Normal Mode (i.e. the VS UV comparator is always enabled
in SBC Normal Mode),
• A 4th consecutive VCC1 under voltage event will lead to SBC Fail-Safe Mode entry and to setting the bit
VCC1_UV _FS
• This counter is cleared:
– when SBC Fail-Safe Mode is entered,
– when the bit VCC1_UV is cleared,
– when a Soft Reset is triggered.
Note: It is recommended to clear the VCC1_UV bit once it was set and detected.
14.6.2 VCC1 Over Voltage
For fail-safe reasons a configurable VCC1 over voltage detection feature is implemented. It is active in SBC Init-,
Normal-, and Stop Mode.
In case the V_CC1,OV,r threshold is crossed, the SBC triggers following measures depending on the configuration:
• The bit VCC1_ OV is always set;
• If the bit VCC1_OV_RST is set and CFGP = ‘1’, then SBC Restart Mode is entered. The FOx outputs are
activated. After the reset delay time (t_RD1), the SBC Restart Mode is left and SBC Normal Mode is resumed
even if the VCC1 over voltage event is still present (see also Figure 53). The VCC1_OV_RST bit is cleared
automatically;
• If the bit VCC1_OV_RST is set and CFGP = ‘0’, then SBC Fail-Safe Mode is entered and FOx outputs are
activated.
Note: In case the VCC1 output current in SBC STOP Mode is below the active peak threshold (I_VCC1,Ipeak) it should
be considered to clear the bit VCC1_OV_RST before entering SBC Stop Mode to avoid unintentional SBC
Restart or Fail-Safe Mode entry and to ignore the VCC1_ OV bit due to external noise.
Data Sheet
113
Rev. 1.1, 2014-09-26