TLE75080-EMH Datasheet, PDF (24/80 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control

TLE75080-EMH
Power Supply
6
Power Supply
The TLE75080-EMH is supplied by four supply voltages:
• V_S (analog supply voltage used also for the logic)
• V_S1 (analog supply voltage used as drain for channels 0, 2, 4 and 6)
• V_S2 (analog supply voltage used as drain for channels 1, 3, 5 and 7)
• V_DD (digital supply voltage)
The V_S supply line is connected to a battery feed and used, in combination with V_DD supply, for the driving circuitry
of the power stages. In situations where V_S voltage drops below V_DD voltage (for instance during cranking events
down to 3.0 V), an increased current consumption may be observed at VDD pin.
V_S and V_DD supply voltages have an undervoltage detection circuit, which prevents the activation of the associated
function in case the measured voltage is below the undervoltage threshold. More in detail:
• An undervoltage on both V_S and V_DD supply voltages prevents the activation of the power stages and any SPI
communication (the SPI registers are reset)
• An undervoltage on V_DD supply prevents any SPI communication. SPI read/write registers are reset to default
values.
• An undervoltage on V_S supply forces the TLE75080-EMH to drain all needed current for the logic from V_DD
supply. All channels are disabled, and are enabled again as soon as V_S ≥ V_S(OP).
Figure 10 shows a basic concept drawing of the interaction between supply pins VS and VDD, the output stage
drivers and SO supply line.
VS1
CP
GD
VS
IVS
VDD
VREG
HS
Ch. 0,2,4,6
VS2
IVDD
UVR
GD
VDD
HS
UVR
VS
Ch. 1,3,5,7
SO
SPI
SupplyConcept_8HS.emf
Figure 10 TLE75080-EMH Internal Power Supply concept
When 3.0 V ≤ V_S ≤ V_DD - V_SDIFF TLE75080-EMH operates in “Cranking Operative Range” (COR). In this condition
the current consumption from VDD pin increases while it decreases from VS pin where the total current
consumption remains within the specified limits. Figure 11 shows the voltage levels at VS pin where the device
goes in and out of COR. During the transition to and from COR operative region, I_VS and I_VDD change between
values defined for normal operation and for COR operation. The sum of both current remains within limits specified
in “Overall current consumption” section (see Table 8).
Data Sheet
24
Rev. 1.0, 2016-06-22