MC33996EKR2 datasheet(10/23 Pages) FREESCALE

部品番号	MC33996EKR2

部品情報	16-Output Switch with SPI Control

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Analog Integrated Circuit Device Data

10

Freescale Semiconductor

33996

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

FUNCTIONAL DESCRIPTION

The 33996 is designed and developed for automotive and

industrial applications. It is a 16-output power switch having

24-bit serial control. The 33996 incorporates SMARTMOS

technology having CMOS logic, bipolar/MOS analog

circuitry, and independent DMOS power output transistors.

Many benefits are realized as a direct result of using this

mixed technology. A simplified internal block diagram of the

33996 is shown in Figure 2, page 2.

FUNCTIONAL PIN DESCRIPTION

CHIP SELECT (CS)

The system MCU selects the 33996 to be communicated

with through the use of the Chip Select (CS) pin. When the CS

pin is in a logic low state, data can be transferred from the

MCU to the 33996 and vise versa. Clocked-in data from the

MCU is transferred from the 33996 Shift register and latched

into the power outputs on the rising edge of the CS signal. On

the falling edge of the CS signal, output fault status

information is transferred from the Power Outputs Status

register into the device’s SO Shift register. The SO pin output

driver is enabled when CS is low, allowing information to be

transferred from the 33996 to the MCU. To avoid any

spurious data, it is essential the high-to-low transition of the

CS

signal occur only when SCLK is in a logic low state.

SYSTEM CLOCK (SCLK)

The System Clock (SCLK) pin clocks the Internal Shift

registers of the 33996. The Serial Input (SI) pin accepts data

into the Input Shift register on the falling edge of the SCLK

signal, while the Serial Output (SO) pin shifts data information

out of the Shift register on the rising edge of the SCLK signal.

False clocking of the Shift register must be avoided, ensuring

validity of data. It is essential that the SCLK pin be in a logic

low state whenever the CS pin makes any transition. For this

reason, it is recommended, though not necessary, that the

SCLK pin is commanded to a low logic state as long as the

device is not accessed (CS in logic high state). When the CS

is in a logic high state, any signal at the SCLK and SI pins is

ignored and the SO is tri-stated (high impedance).

SERIAL INPUT (SI)

The Serial Input (SI) pin is used to enter one of seven

serial instructions into the 33996. SI SPI bits are latched into

the Input Shift register on each falling edge of SCLK. The

Shift register is full after 24 bits of information are entered.

The 33996 operates on the command word on the rising edge

of CS. To preserve data integrity, exercise care not to

transition SI as SCLK transitions from high to low state (see

Figure 4, page 8).

SERIAL OUTPUT (SO)

The Serial Output (SO) pin transfers fault status data from

the 33996 to the MCU. The SO pin remains tri-state until the

CS

pin transitions to a logic low state. All faults on the 33996

are reported to the MCU as logic [1]. Conversely, normal

operating outputs with nonfaulted loads are reported as

logic [0]. On the falling edge of the CS signal, output fault

status information is transferred from the Power Outputs

Status register into the device’s SO Shift register. The first

eight positive transitions of SCLK will provide Any Fault (bit

23), Over-voltage Fault (bit 22), followed by six logic [0]s

(bits 21 to 16). The next 16 successive positive transitions of

SCLK provides fault status for output 15 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.

OUTPUT DRIVER POWER SUPPLY (SOPWR)

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 over-voltage on the SOPWR supply pin.

OUTPUT/INPUT (OUT0–OUT15)

These pins are low-side output switches controlling the

load.

RESET (RST)

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)

The VPWR pin is used as the input power source for the

33996. The voltage on VPWR is monitored for over-voltage

protection and shutdown. An over-voltage condition (> 50

µs)

on the VPWR pin will cause the 33996 to shut down all

outputs until the over-voltage condition is removed. Upon

return to normal input voltage, the outputs will respond as

programmed by the over-voltage bit in the Global Shutdown /

Retry Control register. The over-voltage threshold on the

VPWR pin is specified as 27.5 V to 35 V with 1.4 V typical

hysteresis. Following an over-voltage shutdown of output

drivers, the over-voltage Fault and the Any Fault bits in the

SO bit stream will be logic [1].

PWM CONTROL (PWM)

The PWM Control pin is provided to support PWM of any

combination of outputs. The LOGIC OPERATION section

describes the logic for PWM control.

同様の部品番号 - MC33996EKR2

メーカー	部品番号	データシート	部品情報
Freescale Semiconductor...	MC33996EKR2	1Mb / 24P	16 Output Switch with SPI Control

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