TLE75008-EMD_15 Datasheet, PDF (27/64 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control

TLE75008-EMD
Power Supply
whole device). The device enters Active mode when IDLE pin is set to “high” and one of the input pins is set to
“high” or one OUT.OUTn bit is set to “1”. If HWCR.ACT is set to “0”, the device returns to Idle mode as soon as all
inputs pins are set to “low” and OUT.OUTn bits are set to “0”. If HWCR.ACT is set to “1”, the device remains in Active
mode independenly of the status of input pins and OUT.OUTn bits. An undervoltage condition on V_DD supply brings
the device into Idle mode, if all input pins are set to “low”. Even if the registers MAPIN0 and MAPIN1 are both set
to “00_H” but one of the input pins INn is set to “high”, the device goes into Active mode.
6.1.5 Limp Home mode
TLE75008-EMD enters Limp Home mode when IDLE pin is “low” and one of the input pins is set to “high”,
switching ON the channel connected to it. SPI communication is possible but only in read-only mode (SPI registers
can be read but cannot be written). More in detail:
• UVRVS and LOPVDD are set to “1”
• MODE bits are set to “01_B” (Limp Home mode)
• TER bit is set to “1” on the first SPI command after entering Limp Home mode. Afterwards it works normally
• OLOFF bits is set to “0”
• ERRn bits work normally
• DIAG_OSM.OUTn bits can be read and work normally
• All other registers are set to their default value and cannot be programmed as long as the device is in Limp
Home mode
See Table 6 for a detailed overview of supply voltage conditions required to switch ON channels 2 and 3 during
Limp Home. All other channels are OFF.
A transmission of SPI commands during transition from Active to Limp Home mode or Limp Home to Active mode
may result in undefined SPI responses.
6.1.6 Definition of Power Supply modes transition times
The channel turn-ON time is as defined by parameter t_ON when TLE75008-EMD is in Active mode or in Limp Home
mode. In all other cases, it is necessary to add the transition time required to reach one of the two aforementioned
Power Supply modes (as shown in Figure 13).
Data Sheet
27
Rev. 1.1, 2015-09-25