MC33996 데이터 시트보기 (PDF) - Motorola => Freescale
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MC33996 Datasheet PDF : 16 Pages
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Freescale Semiconductor, Inc.
to output 0. Refer to the LOGIC OPERATION section (below)
for more information. The SI/SO shifting of data follows a first-
in, first-out protocol, with both input and output words
transferring the Most Significant Bit (MSB) first.
SO Output Driver Power Supply (SOPWR) Pin
The SOPWR pin is used to supply power to the 33996 SO
output driver and Power-ON Reset (POR) circuit. To achieve
low standby current on VPWR supply, power must be removed
from the SOPWR pin. The 33996 will be in reset with all drivers
OFF when SOPWR is below 2.5 V. The 33996 does not detect
overvoltage on the SOPWR supply pin.
Output/Input (OUT0–OUT15) Pins
These pins are low-side output switches controlling the load.
Reset (RST) Pin
The Reset (RST) pin is the active low reset input pin used to
turn OFF all outputs, thereby clearing all internal registers.
Battery Input (VPWR) Pin
The VPWR pin is used as the input power source for the
33996. The voltage on VPWR is monitored for overvoltage
protection and shutdown. An overvoltage condition (> 50 µs) on
the VPWR pin will cause the 33996 to shut down all outputs
until the overvoltage condition is removed. Upon return to
normal input voltage, the outputs will respond as programmed
by the overvoltage bit in the Global Shutdown/Retry Control
register. The overvoltage threshold on the VPWR pin is
specified as 27.5 V to 35 V with 1.4 V typical hysteresis.
Following an overvoltage shutdown of output drivers, the
Overvoltage Fault and the Any Fault bits in the SO bit stream
will be logic [1].
PWM Pin
The PWM Control pin is provided to support PWM of any
combination of outputs. The LOGIC OPERATION section
describes the logic for PWM control.
LOGIC OPERATION
Introduction
The 33996 provides flexible control of 16 low-side driver
outputs. The device allows PWM and ON/OFF control through
the use of several 24-bit input command words. This section
describes the logic operation and command registers of the
33996.
The 33996 message set consists of seven messages as
shown in Table 1. Bits 23 through18 determine the specific
command and bits 15 through 0 determine how a specific
output will operate. The 33996 operates on the command word
on the rising edge of CS.
Note Upon Power-ON Reset all bits are defined as shown in
Table 1.
Commands
Table 1. SPI Control Commands
MSB
Bits
LSB
23 22 21 20 19 18
17
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ON/OFF Control
0=off, 1=on
0
0
0000
X
X
0000000000000000
Open Load Current Enable
0=disable, 1=enable
0
0
0001
X
X
0000000000000000
Global Shutdown/Retry
Control
0=shutdown, 1=retry
0
0
0
0
1
0
Thermal
Bit 0
Over-
voltage
0
XXXXXXXXXXXXXXXX
SFPD Control
1=therm only, 0=VDS
0
0
0011
X
X
1111111111111111
PWM Enable
0=SPI only, 1=PWM
0
0
0100
X
X
0000000000000000
AND/OR Control
0=PWM pin AND with SPI 0
0
0101
X
1=PWM pin OR with SPI
X
0000000000000000
Reset
SO Response
0=No Fault, 1=Fault
0
0
0110
X
Any Over-
Fault voltage
0
0
0
0
0
X
XXXXXXXXXXXXXXXX
0
OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ON/Off Control Register
To program the 16 outputs of the 33996 ON or OFF, a 24-bit
serial stream of data is entered into the SI pin. The first 8 bits of
the control word are used to identify the on/off command and
the remaining 16 bits are used to turn ON or OFF the specific
output driver.
MOTOROLA ANALOG INTEGRATED CIRFCoUrITMDoErVeICEInDfAoTrAmation On This Product,
Go to: www.freescale.com
33996
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