MC33984CHFKR2 Freescale Semiconductor, MC33984CHFKR2 Datasheet - Page 28

• Manufacturer Part Number: MC33984CHFKR2
• Description: Power Switch ICs - Power Distribution Dual 4mOhms smart
• Manufacturer: Freescale Semiconductor

Specifications of MC33984CHFKR2

• Rohs: yes
• On Resistance (max): 4 mOhms
• On Time (max): 100 us
• Off Time (max): 500 us
• Operating Supply Voltage: 6 V to 27 V
• Maximum Operating Temperature: + 125 C
• Package / Case: PQFN-16
• Minimum Operating Temperature: - 40 C

Address x111 — TEST
accessible with SPI during normal operation.
SERIAL OUTPUT COMMUNICATION 
(DEVICE STATUS RETURN DATA)
loaded. Meanwhile, the data is clocked out MSB- (OD7-) first
as the new message data is clocked into the SI pin. The first
eight bits of data clocking out of the SO, and following a
transition, are dependant upon the previously written SPI
word.
be representative of the initial message bits clocked into the
SI pin since the
feature is useful for daisy chaining devices as well as
message verification.
transition of Logic [0] to Logic [1]. If there is a valid message
length, the data is latched into the appropriate registers. A
valid message length is a multiple of eight bits. At this time,
the SO pin is tri-stated and the fault status register is now
able to accept new fault status information.
the STATR-selected register data at the time that the
pulled to a Logic [0] during SPI communication and / or for the
period of time since the last valid SPI communication, with
the following exceptions:
28
33984
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
The TEST register is reserved for test and is not
When the
Any bits clocked out of the SO pin after the first eight will
A valid message length is determined following a
The output status register correctly reflects the status of
• The previous SPI communication was determined to be
• Battery transients below 6.0 V resulting in an under-
invalid. In this case, the status will be reported as
though the invalid SPI communication never occurred.
voltage shutdown of the outputs may result in incorrect
data loaded into the status register. The SO data
transmitted to the MCU during the first SPI
communication following an under-voltage V
condition should be ignored.
CS
CS
pin is pulled low, the output status register is
pin first transitioned to a Logic [0]. This
PWR
CS
CS
CS
is
SERIAL OUTPUT BIT ASSIGNMENT
serial input message, as explained in the following
paragraphs.
addressed during the prior communication. The value of the
previous D7 will determine which output the status
information applies to for the Fault (FLTR), SOCHLR,
CDTOLR, and DICR registers. SO data will represent
information ranging from fault status to register contents,
user selected by writing to the STATR bits D2:D0. Note that
the SO data will continue to reflect the information for each
output (depending on the previous D7 state) that was
selected during the most recent STATR write until changed
with an updated STATR write.
Previous Address SOA[2:0] = 000
reflect the current state of the Fault register (FLTR)
corresponding to the output previously selected with the bit
OD7
Previous Address SOA[2:0] = 001
programmed bits, respectively. Data in bits OD3:OD2 contain
CSNS0
Previous Address SOA[2:0] = 010
high detection level (refer to
OD2:OD0 contain the programmed over-current low
detection levels (refer to
• The
The 8 bits of serial output data depend on the previous
Bit OD7 reflects the state of the watchdog bit (D7)
If the previous three MSBs are 000, bits OD6 : OD0 will
Data in bits OD1:OD0 contain CSNS0
The data in bit OD3 contain the programmed over-current
(Table
the WAKE pin is at Logic [0] may result in incorrect data
loaded into the status register. The SO data transmitted
to the MCU during the first SPI communication following
this condition should be ignored.
EN
RST
and IN0_SPI programmed bits, respectively.
17).
Table 16
pin transition from a Logic [0] to Logic [1] while
summarizes the SO register content.
Analog Integrated Circuit Device Data
Table
Table
13).
Freescale Semiconductor
12), and the data in bits
EN
and IN0_SPI