Document
Freescale Semiconductor Advance Information
16 Output Switch with SPI Control
The 33996 is a 16-output low side switch with a 24-bit serial input control. It is designed for a variety of applications including inductive, incandescent, and LED loads. The Serial Peripheral Interface (SPI) provides both input control and diagnostic readout. A Pulse Width Modulation (PWM) control input is provided for pulse width modulation of multiple outputs at the same duty cycle. A dedicated reset input provides the ability to clear all internal registers and turn all outputs off.
The 33996 directly interfaces with micro controllers and is compatible with both 3.3 and 5.0V CMOS logic levels. The 33996, in effect, serves as a bus expander and buffer with fault management features that reduce the MCU’s fault management burden.
Features
• Designed to operate 5.0V < VPWR < 27V • 24 Bit SPI for control and fault reporting, 3.3/5.0V compatible • Outputs are current limited (0.9 to 2.5A) to drive incandescent
lamps • Output voltage clamp of +50V during inductive switching • On/Off control of open load detect current (LED application) • VPWR standby current < 10μA • RDS(ON) of 0.55Ω at 25°C typical • Independent over-temperature protection • Output selectable for PWM control • Output ON short-to-VBAT and off short-to-ground/open detection • Pb-free packaging designated by suffix code EK
Document Number: MC33996 Rev. 8.0, 8/2008
33996
LOW SIDE SWITCH
EK SUFFIX (PB-FREE) 98ARL10543D
32-PIN SOICW EXPOSED PAD
ORDERING INFORMATION
Device
MC33996EK/R2 MCZ33996EK/R2
Temperature Range (TA)
Package
-40°C to 125°C 32 SOICW-EP
Vdd
3.3 V/5.0 V
VPWR
VBAT
33996
VDD
MCU
SCLK CS
MISO MOSI PWM
RST
SOPWR
VPWR
SCLK CS SI SO PWM RST
OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14 OUT15
GND
Solenoid/Relay LED
/8 Lamp
Figure 1. 33996 Simplified Application Diagram
* This document contains certain information on a new product. Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007-2008. All rights reserved.
IINTERNAL BLOCK DIAGRAM
PWM RST CS SCLK
SI SO SOPWR
IINTERNAL BLOCK DIAGRAM
VPWR
VDD
10μA 25μA 10μA Input Buffers 10μA
Over-voltage Detect
OVD VDD RB SFPDB SFL CS SCLK SI SO CSI CSBI
Voltage Regulator
GE OT SF OF
Open Load Detect Enable
10 μA
Serial D/O Line Driver
SPI Interface
Logic
VDD
Bias
50V
Gate Control
To Gates 1 to 15
VRef
50μA
ILimit RS
Short and Open Load Detect
Over-temperature Detect
From Detectors 1 to 15
OUT0 OUT1-15 GND (8)
Figure 2. 33996 Simplified Internal Block Diagram
33996
2
Analog Integrated Circuit Device Data Freescale Semiconductor
PIN CONNECTIONS
PIN CONNECTIONS
OUT0
1
32
OUT1
2
31
SOPWR
3
30
OUT2
4
29
OUT3
5
28
VPWR
6
27
GND
7
26
GND
8
25
GND
9
24
GND
10
23
SCLK
11
22
OUT4
12
21
OUT5
13
20
CS
14
19
OUT6
15
18
OUT7
16
17
OUT15 OUT14 PWM OUT13 OUT12 RST GND GND GND GND SO OUT11 OUT10 SI OUT9 OUT8
Figure 3. 33996 Pin Locations Table 1. Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.
Pin
Pin Name
Formal Name
Definition
1, 2, 4, 5, 12, 13, 15 – 18, 20, 21, 28, 29, 31, 32
OUT0 – OUT15
3
SOPWR
6
VPWR
7– 10, 23 – 26
GND
11
SCLK
14
CS
19
SI
22
SO
27
RST
30
PWM
33
EP
Output 0 – Output 15
SOPWR Supply Battery Input
Ground System Clock
Chip Select Serial Input Serial Output
Reset PWM Control Exposed Pad
Open drain output pin.
Power supply pin to the SO output driver. Battery supply input pin. Ground for logic, analog, and power output devices. System Clock for internal shift registers of the 33996. SPI control chip select input pin from the MCU to the 33996. Serial data input pin to the 33996. Serial data output pin. Active low reset input pin. PWM control input pin. Supports PWM on any combination of outputs. Device will perform as specified with the Exposed Pad un-terminated (floating) however, it is recommended that the Exposed Pad be terminated to system ground.
Analog Integrated Circuit Device Data Freescale Semiconductor
33996
3
ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Value
Unit
ELECTRICAL RATINGS VPWR Supply Voltage (1) SO Output Driver Power Supply Voltage (1) SPI Interface Logic Input Voltage (CS, PWM, SI, SO, SCLK, RST) (1)
Output Drain Voltage Frequency of SPI Operation (2) Output Clamp Energy (3) ESD Voltage (4)
Human Body Model Machine Model
THERMAL RATINGS
Operating Temperature Ambient Junction Case
Storage Temperature Power Dissipation (TA = 25°C) (5) Peak Package Reflow Temperature During Reflow (6), (7)
Thermal Resistance Junction-to-Ambient (8) Junction- to-Lead (9) Junction-to-Flag
VPWR SOPWR
VIN VD
fSPI
ECLAMP
VESD1 VESD2
.