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| BTS54040-LBF_15 Datasheet, PDF (22/67 Pages) Infineon Technologies AG – SPI Power Controller | |||
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BTS54040-LBF
Power Supply
Table 5 shows the correlation between device operation modes, VS and VDD supply voltages, and the state of the
most important functions (channel status, SPI communication and SPI registers).
Table 5 Device function in relation to operation modes, VS and VDD voltages
Operation Mode Function
VS ⤠VSMON
VSMON > VS ⤠VS(UV)
Stand-by
Channels
OFF
OFF
SPI comm.
available1)
available1)
VS > VS(UV)
OFF
available1)
SPI registers
available1)
available1)
available1)
Idle
Channels
OFF
OFF
OFF
SPI comm.
SPI registers
all commands
rejected1)
available1)
available1)
available1)
available1)
available1)
Ready
Channels
SPI comm.
SPI registers
OFF
available1)
available1)
OFF
available1)
available1)
OFF
available1)
available1)
Operative
Channels
SPI comm.
OFF
all commands
rejected1)
OFF
available1)
follow OUT.OUTn
and/or Input pins
available1)
SPI registers
available1)
available1)
available1)
Limp Home
Channels
OFF
OFF
follow Input pins
SPI comm.
available
(read-only)1)2)
available
(read-only)1)2)
available
(read-only)1)2)
SPI registers
reset
reset
reset
1) If VDD > VDD(PO), otherwise not available or in reset.
2) HWCR.CTC and HWCR.RST commands are accepted.
5.1.1 Power-up
The Power-up condition is entered when one of the supply voltages (VS or VDD) is applied to the device. Both
supplies are rising until they are above the undervoltage thresholds VS(OP) and VDD(PO) therefore the internal power-
on signals are set.
5.1.2 Stand-by mode
When BTS54040-LBF is in Stand-by mode, all outputs are OFF. The SPI registers can be programmed if VDD >
VDD(PO). The current consumption is minimum (see parameter IVS(STB)). The circuitry that monitors VS versus the
threshold VSMON is disabled, allowing the programming of the registers. Even if one Input pin is set to âhighâ or if
one OUT.OUTn bit is set to â1â, all outputs stay switched OFF.
5.1.3 Idle mode
In Idle mode, the internal supply circuitry is working and the device current consumption is increased. All channels
are OFF and a command to switch ON one or more outputs (either via SPI or via Input pins) is accepted and
executed, bringing the device into Operative mode.
Data Sheet
22
Rev. 2.1, 2014-12-05
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