BTS54040-LBF_15 Datasheet, PDF (21/67 Pages) Infineon Technologies AG – SPI Power Controller

BTS54040-LBF
Power Supply
5.1
Operation modes
BTS54040-LBF has the following operation modes:
• Stand-by mode
• Idle mode
• Ready mode
• Operative mode
• Limp Home mode
The transition between operation modes is determined according to these variables:
• logic level at LHI pin
• logic level at INn pins
• DCR.MUX bits state
• OUT.OUTn bits state
The state diagram including the possible transitions is shown in Figure 10. The behavior of BTS54040-LBF as
well as some parameters may change in dependence from the operation mode of the device. Furthermore, due
to the undervoltage detection circuitry which monitors V_S and V_DD supply voltages, some changes within the same
operation mode can be seen accordingly.
Power -up
Idle
DCR.MUX ≠ "111"
Stand-by
LHI = "low"
& INn = "low"
DCR.MUX = "111" or
VDD < VDD(PO) or
HWCR.RST = "1"
LHI = "high"
OUT.OUTn = "1"
or INn = "high"
OUT.OUTn = "0"
& INn = "low"
(^VD_(H^D_W^<C^VR.DDR(PSOT)
&
=
INn
"1"
=
&
I„Nlonw“=) ^{o„lorw“)}
OUT.OUTn = "1
or INn = "high"
"
OUT.OUTn = "0" or
(V_DD < V_DD(PO) & INn = "low") or
HWCR.RST = "1"
Operative
DCR.MUX ≠ "111"
Ready
LHI = "low"
& INn = "high"
DCR.MUX = "111" or
(VDD < VDD(PO ) & INn = "high") or
(HWCR.RST = "1" & INn = "high")
LHI = "high"
LHI = "high"
Note: Registers which are not mentioned are considered to be in default state
LHI = "high"
Limp Home
PowerSupply_OpModes.emf
Figure 10 Operation Mode state diagram
There are three parameters describing the behavior of BTS54040-LBF:
• status of output channels
• status of SPI registers
• status of SPI communication
It is necessary to set DCR.MUX to a value different from 111_B to command a switch ON of one or more channels.
In alternative it is necessary to set the LHI to “high” - in this case the logic state of the Input pins is reflected to the
outputs (if there is no undervoltage condition on V_S supply).
Data Sheet
21
Rev. 2.1, 2014-12-05