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33793A Schematic ( PDF Datasheet ) - Freescale Semiconductor

Teilenummer 33793A
Beschreibung Distributed System Interface (DSI) Sensor Interface
Hersteller Freescale Semiconductor
Logo Freescale Semiconductor Logo 




Gesamt 27 Seiten
33793A Datasheet, Funktion
www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
Distributed System Interface
(DSI) Sensor Interface
The 33793 is a slave Distributed System Interface (DSI) device
that is optimized as a sensor interface. The device contains circuits
to power sensors such as accelerometers and to digitize the analog
level from the sensor. The device is controlled by commands over the
DSI bus and returns measured data over the bus.
Features
• Conforms to DSI Specification Version 1
• 4-Channel, 8-Bit Analog-to-Digital Converter (ADC)
• 4 Pins Configurable as Analog or Logic Inputs or as Logic
Outputs
• Provides Regulated +5.0 V Output for Sensor Power from Bus
• Additional High-Drive Logic Output
• Undervoltage Fault Detection and Signaling
• On-Board Clock (No External Elements Required)
• Field-Programmable Address
• Default and Field-Programmable as a DSI Daisy Chain Device
• Recognizes Reverse Initialization for Open Bus Fault Tolerance
• Detects Short to Battery on Bus Switch and Prevents Its Closure
• Pb-Free Packaging Designated by Suffix Code EF
Document Number: MC33793
Rev 13.0, 11/2006
33793/A
DISTRIBUTED SYSTEM INTERFACE
SCALE 2:1
D SUFFIX
EF SUFFIX (Pb-FREE)
98ASB42566B
16-PIN SOICN
ORDERING INFORMATION
Device
MC33793D/R2
Temperature
Range (TJ)
Package
MCZ33793EF/R2 -40°C to 150°C
16 SOICN
MCZ33793AEF/R2
33790
GND
DSIO
X-Y
Accelerometer
Error
Test
X
Y
VCC
GND
33793
BUSIN
BUSRTN
I/O0
I/O1
I/O2
I/O3 BUSOUT
H_Cap
REGOUT
LOGOUT
AGND
Multiple
DSI Slaves
33793
BusIN
Figure 1. 33793 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as
may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2006. All rights reserved.






33793A Datasheet, Funktion
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. Static Electrical Characteristics
Characteristics noted under conditions -0.3 V VBUSIN or VBUSOUT 30 V, 5.5 V < VH_CAP < 30 V, -40°C < TA < 85°C unless
otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless
otherwise noted.
Characteristic
Symbol Min Typ Max Unit
Internal Quiescent Current Drain
VH_CAP = 25 V, Logout = 0, I/O = Input
BUSIN or BUSOUT to H_CAP Rectifier Voltage Drop
IBUSIN or IBUSOUT = 15 mA
IBUSIN or IBUSOUT = 100 mA
BUSIN + BUSOUT Bias Current
VBUSIN or VBUSOUT = 8.0 V, VH_CAP = 9.0 V
VBUSIN or VBUSOUT = 0.5 V, VH_CAP = 25 V
Rectifier Leakage Current
VBUSIN or VBUSOUT = 5.0 V, VH_CAP = 25 V
Reg0ut
5.5 V > VH_CAP > 25 V, IRO = 12 mA
RegOut Line Regulation
IRO = 12 mA, 5.5 V > VH_CAP > 25 V
RegOut Load Regulation
IRO = 0 to 12 mA, 5.5 V > VH_CAP > 25 V
Undervoltage Lockout
Proportional to unloaded VREGOUT
Bus Switch Resistance
VBI = 8.0 V, IBO = -80 mA (Bus Switch Active)
I/O0 and I/O3 Pull-Down Current
0 < VBUSIN or VBUSOUT < 1.0 V
I/O1 and I/O2 Pull-Up Current
VRO < VBUSIN or VBUSOUT < VRO - 1.0 V
BUSIN and BUSOUT Logic Thresholds
Low
High
Logic Duty Cycle (assured by design)
Logic 0
Logic 1
BUSIN + BUSOUT Response Current
VBUSIN and/or VBUSOUT = 4.0 V
ADC Code Conversion Error (INL)
ADC Full-scale Error
I/O Logic Input Thresholds
Logic High
Logic Low
IQ
VRECT
IBIAS
IRLKG
VREG
VRLINE
VRLD
VUVL
RSW
IPD
IPU
VTHL
VTHH
DCL
DCH
IRSP
ADCINL
ADCFS
VIH
VIL
-100
-20
4.75
0.93
7.0
-7.0
2.8
5.5
10
60
9.9
0.7
0.75
0.9
5.0
71
2.3
0.95
4.0
11
-11
3.0
6.0
33
67
11
0.54
0.51
3.0
1.0
1.2
100
20
100
5.25
180
100
0.97
8.0
13
-13
3.2
6.5
40
90
12.1
< 1.0
3
0.3
mA
V
µA
µA
V
mV
mV
VRO
µA
µA
V
%
mA
LSB
counts
VRO
33793
6
Analog Integrated Circuit Device Data
Freescale Semiconductor

6 Page









33793A pdf, datenblatt
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
• Read the general purpose I/O logic values and respond
to request for these values.
• Generating a cycle redundancy check (CRC) for the
received data and transmitted data in conformance with
the DSI Bus Standard.
Additionally, the control logic performs error checking on
the received data. If errors are found, no action is taken and
no response is made. Errors include:
• CRC received doesn’t match CRC of received data.
• Number of received bits is not 12 or 20.
CLOCK
The clock is a low-stability type with the capacitor
integrated onto the die. The signaling system and all internal
operations are such that no external precision timing device
is needed in the normal operation of this device.
BUS SWITCH (BUSSW)
The bus switch passes signaling and power to all
subsequent devices on the bus. It can block a voltage of
either polarity up to the highest idle state level between
BUSIN and BUSOUT.
LOGICOUT
LOGICOUT is a logic level output with enhanced high-side
drive capability.
ADDRESSING
The 33793 IC supports both runtime programmable and
pre-programmed addressing as defined in the DSI
Specification. Runtime programmable addressing uses the
daisy chain bus connection. Pre-programmed devices may
either be connected in daisy chain or in parallel on the bus
wires.
Programmable address devices all power up with a device
address of $0 in their address register and their bus switches
open. In the daisy chain, if the first device receives the
initialization command device on BUSIN, it will accept the
address in the command and close its switch at the end of the
command. The next device in the chain will now be able to
receive the initialization command on its BUSIN and will
accept the next address. This proceeds down the chain until
the last device is addressed. The devices can also be
initialized by the reverse initialization command if the signal is
applied to BUSOUT.
Pre-programmed devices power up with their pre-
programmed address in its address register. It will ignore all
Initialization commands unless the address in the command
matches its pre-programmed address. In this event the
device stores the other information contained in the
Initialization command.
33793
12
Analog Integrated Circuit Device Data
Freescale Semiconductor

12 Page





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