ZSSC5101BE2B [RENESAS]
xMR Sensor Signal Conditioner;
| 型号： | ZSSC5101BE2B |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | xMR Sensor Signal Conditioner |
| 文件： | 总29页 (文件大小：804K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ZSSC5101
xMR Sensor Signal Conditioner
Datasheet
Brief Description
Benefits
The ZSSC5101 is a CMOS integrated circuit for con-
verting sine and cosine signals obtained from
magnetoresistive bridge sensors into a ratiometric
analog voltage with a user-programmable range of
travel and clamping levels.
•
•
No external trimming components required
PC-controlled configuration and single-pass
calibration via one-wire interface allows
programming of fully assembled sensors
•
•
Can be used with low-cost ferrite magnets
The ZSSC5101 accepts sensor bridge arrangements
for both rotational as well as linear movement.
Depending on the type of sensor bridge, a full-scale
travel range of up to 360 mechanical degrees can be
obtained.
Allows large air gaps between sensors and
magnets
•
Optimized for automotive environments with
extended temperature range and special
protection circuitry with excellent electro-
magnetic compatibility
Programming of the device is performed through the
output pin, allowing in-line programming of fully
assembled 3-wire sensors. Programming param-
eters are stored in an EEPROM and can be re-pro-
grammed multiple times.
•
•
•
•
•
Power supply monitoring
Sensor monitoring
Detection of EEPROM memory failure
Connection failure management
The ZSSC5101 is fully automotive-qualified with an
ambient temperature range up to 160°C.
High accuracy: ± 0.15° integral nonlinearity (INL)
after calibration
Features
Available Support
•
•
•
•
Ratiometric analog output
Up to 4608 analog steps
Step size as small as 0.022°
•
•
Evaluation Kit
Application Notes
Programming through output pin via
one-wire interface
Physical Characteristics
•
•
•
Wide operation temperature: -40 C to +160 C (die)
Supply voltage: 4.5V to 5.5V
•
•
Offset calibration of the bridge input signals
Programmable linear transfer characteristic:
SSOP-14 package, bare die, or unsawn wafer
.
.
.
.
Zero position
Angular range
ZSSC5101 Typical Application Circuit
Upper and lower clamping levels
Rising or falling slope
Sensor Bridges
VDDS
•
•
Loss of magnet indication with programmable
threshold level
Accepts anisotropic, giant, and tunnel magneto-
resistive bridge sensors (AMR, GMR and TMR)
VSINP
VSINN
CB
100nF
+5V
Load
Circuit
VDDE
VOUT
VSSE
•
•
Programmable 32-bit user ID
CRC, error detection, and error correction
on EEPROM data
VCOSP
VCOSN
Rout
Cout
•
•
Diagnostics: broken-wire detection
Automotive-qualified to AEC-Q100, grade 0
VSSS
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January 22, 2016
ZSSC5101
xMR Sensor Signal Conditioner
Datasheet
ZSSC5101 Block Diagram
Applications
VDDE
•
•
•
•
•
•
•
•
Absolute Rotary Position Sensor
Steering Wheel Position Sensor
Pedal Position Sensor
Digital Signal Processing and Control
VDDS
VSSS
VDDS
VSSS
One-Wire
EEPROM
Sin
Power Supply Regulators
Interface
Throttle Position Sensor
Float-Level Sensor
VSINP
VSINN
VCOSP
VCOSN
Cordic
DAC
Buffer
Amp.
VOUT
VDDS
VSSS
MUX
PGA
ADC
Ride Height Position Sensor
Non-Contacting Potentiometer
Rotary Dial
Algorithm
Cos
Analog Frontend AFE
Interface
VSSE
Application Circuit for AMR Sensors
Application Circuit for TMR Sensors
TMR Sensor Bridge
e.g., MDT MMA253F
AMR Sensor Bridge
VDDS
1
VCC
VDDS
Rs
VSINP
VSINN
CB
100nF
3
X+
VSINP
+5V
Load
Circuit
+5V
VDDE
VOUT
VSSE
10
12
Load
Circuit
Rp
Rs
VDDE
VOUT
VSSE
CB
100nF
X-
5
2
VSINN
Rs
Rs
VCOSP
VCOSN
Rout
Cout
Y+
Rout
Cout
VCOSP
11
Rp
6
4
VCOSN
VSSS
GND
Y-
VSSS
Rs=51k
Rp = 5k
Ω
Ω
to 10kΩ
Ordering Information
Sales Code
Description
Delivery Package
ZSSC5101BE1B
ZSSC5101BE2B
ZSSC5101BE3B
ZSSC5101 Die – Temperature range: -40°C to +160°C
ZSSC5101 Die – Temperature range: -40°C to +160°C
ZSSC5101 Die – Temperature range: -40°C to +160°C
8” tested wafer, unsawn, thickness = 390 ±15µm
8” tested wafer, unsawn, thickness = 725 ±15µm
8” tested wafer, unsawn, thickness = 250 ±15µm
ZSSC5101BE1C ZSSC5101 Die – Temperature range: -40°C to +160°C
8” tested wafer, sawn on frame, thickness = 390 ±15µm
ZSSC5101BE4R ZSSC5101 SSOP-14 – Temperature range: -40°C to +150°C 13” tape and reel
ZSSC5101BE4T
ZSSC5101 KIT
ZSSC5101 SSOP-14 – Temperature range: -40°C to +150°C Tube
Evaluation Kit: USB Communication Board, ZSSC5101 AMR board, adapters. Software is downloaded (see data sheet).
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January 22, 2016
Contents
1
IC Characteristics ............................................................................................................................................. 5
1.1. Absolute Maximum Ratings....................................................................................................................... 5
1.2. Operating Conditions................................................................................................................................. 5
1.3. Electrical Parameters ................................................................................................................................ 6
1.3.1. ZSSC5101 Characteristics.................................................................................................................. 6
1.3.2. Input Stage Characteristics................................................................................................................. 7
1.3.3. Digital Calculation Characteristics ...................................................................................................... 8
1.3.4. Analog Output Stage Characteristics (Digital to VOUT) ..................................................................... 9
1.3.5. Analog Input to Analog Output Characteristics (Full Path) ...............................................................10
1.3.6. Digital Interface Characteristics (CMOS compatible) .......................................................................10
1.3.7. Supervision Circuits .......................................................................................................................... 11
1.3.8. Power Loss Circuit ............................................................................................................................ 11
Circuit Description .......................................................................................................................................... 12
2.1. Overview.................................................................................................................................................. 12
2.2. Functional Description............................................................................................................................. 12
2.3. One-Wire Interface and Command Mode (CM) ...................................................................................... 13
2.4. Power-Up/Power-Down Characteristics .................................................................................................. 14
2.5. Power Loss / GND Loss .......................................................................................................................... 14
2.5.1. Purpose............................................................................................................................................. 14
2.5.2. Power Loss Behavior........................................................................................................................ 14
2.6. Diagnostics Mode (DM)........................................................................................................................... 15
EEPROM........................................................................................................................................................ 16
3.1. User Programmable Parameters in EEPROM ........................................................................................ 16
3.2. CRC Algorithm......................................................................................................................................... 16
3.3. EDC Algorithm......................................................................................................................................... 16
Application Circuit Examples.......................................................................................................................... 17
4.1. Typical Application Circuit for AMR Double Wheatstone Sensor Bridges...............................................17
4.2. Typical Application Circuit for TMR Sensor Bridges................................................................................ 18
4.3. Mechanical Set-up for Absolute Angle Measurements ........................................................................... 18
4.4. Mechanical Set-up for Linear Distance Measurements .......................................................................... 20
4.5. Input-to-Output Characteristics Calculation Examples............................................................................ 21
ESD and Latch-up Protection......................................................................................................................... 22
5.1. Human Body Model................................................................................................................................. 22
5.2. Machine Model ........................................................................................................................................ 22
5.3. Charged Device Model............................................................................................................................ 22
5.4. Latch-Up .................................................................................................................................................. 22
Pin Configuration and Package Dimensions.................................................................................................. 23
2
3
4
5
6
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January 22, 2016
6.1. Package Drawing – SSOP-14 ................................................................................................................. 24
6.2. Die Dimensions and Pad Coordinates .................................................................................................... 25
Layout Requirements ..................................................................................................................................... 25
Reliability and RoHS Conformity.................................................................................................................... 25
Ordering Information ...................................................................................................................................... 26
7
8
9
10 Related Documents........................................................................................................................................ 26
11 Glossary ......................................................................................................................................................... 27
12 Document Revision History............................................................................................................................ 28
List of Figures
Figure 2.1 ZSSC5101 Block Diagram................................................................................................................ 12
Figure 4.1 ZSSC5101 with AMR Sensor Bridge................................................................................................ 17
Figure 4.2 ZSSC5101 with TMR Sensor Bridge ................................................................................................ 18
Figure 4.3 Mechanical Set-up for Rotational Measurements and Programming Options .................................19
Figure 4.4 Mechanical Set-up for Linear Distance Measurements and Programming Options ........................20
Figure 4.5 Input-to-Output Characteristics with Parameters.............................................................................. 21
Figure 6.1 Package Dimensions – SSOP-14..................................................................................................... 24
Figure 6.2 Pin Map and Pad Position of the ZSSC5101 SSOP-14 Package ....................................................25
List of Tables
Table 1.1
Table 1.2
Table 1.3
Table 1.4
Table 1.5
Table 1.6
Table 1.7
Table 1.8
Table 1.9
Absolute Maximum Ratings................................................................................................................ 5
Operating Conditions .......................................................................................................................... 5
Electrical Characteristics .................................................................................................................... 6
Input Stage Characteristics................................................................................................................. 7
Digital Calculation Characteristics ...................................................................................................... 8
Analog Output Stage Characteristics ................................................................................................. 9
Full Analog Path Characteristics....................................................................................................... 10
Digital Interface Characteristics........................................................................................................ 10
Supervision Circuits .......................................................................................................................... 11
Table 1.10 Power Loss Circuit............................................................................................................................ 11
Table 2.1
Table 2.2
Table 2.3
Table 3.1
Table 6.1
Output Modes during Power-Up and Power-Down .......................................................................... 14
Power Loss Behavior........................................................................................................................ 14
Diagnostics Mode ............................................................................................................................. 15
EEPROM — User Area .................................................................................................................... 16
Pin Configuration .............................................................................................................................. 23
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January 22, 2016
1
IC Characteristics
1.1. Absolute Maximum Ratings
Table 1.1 Absolute Maximum Ratings
Parameter
Symbol
VDDE
Min
-0.3
-0.3
-0.3
-0.3
Typ.
Max
Unit
1.1.1.1.
1.1.1.2.
1.1.1.3.
1.1.1.4.
1.1.1.5.
Supply voltage at VDDE pin
Voltage at VDDS pin
5.7
V
V
VDDS
VDDE+0.3
VDDS
Voltage at VSINP, VSINN, VCOSP, and VCOSN pins
Voltage at VOUT pin
V
VOUT
TS
VDDE+0.3
160
V
Storage temperature
-60
°C
1.2. Operating Conditions
Table 1.2 Operating Conditions
Note: See important notes at the end of the table.
Parameter
Symbol
VDDE
TA
Min
Typ. Max
Unit
V
1.2.1.1.
1.2.1.2.
1.2.1.3.
1.2.1.4.
1.2.1.5.
1.2.1.6.
1.2.1.7.
1.2.1.8.
1.2.1.9.
1.2.1.10.
1.2.1.11.
Supply voltage for normal operation
4.5
-40
-60
-40
10
5.0
5.7
160
160
150
150
Operating ambient temperature range, bare die 1)
°C
°C
°C
°C
nF
mA
nF
kΩ
°/s
ms
1), 2)
Extended ambient temperature range, bare die
Operating ambient temperature range, SSOP-14
Temperature range – EEPROM programming
Blocking capacitance between VDDE and VSSE pins
Sensor bridge current (sine and cosine)
Capacitive load at outputs
TA
TA
TA-EEP
CB
75
100
IBRIDGE
COUT
RLOAD
4.0
20
Output pull-up or pull-down load
5
Angular rate (mechanical)
1000
EEPROM programming time for a single address
(condition: fDIGITAL is within specification; see 1.3.1.7)
tPROG
tRET
20
17
1.2.1.12.
Data retention time of memory over lifetime at
maximum average temperature 50°C
years
1.2.1.13.
1.2.1.14.
EEPROM endurance
200
cycles
mV/V
Range of differential input voltage
(range of differential sensor output signal)
VIN-RANGE
±23
+4
1.2.1.15.
1.2.1.16.
Range of offset voltage at input that can be digitally
compensated
VOFFSET-COMP
TCOEFF-RANGE
-4
-4
mV/V
Range of offset temperature compensation at input
that can be digitally compensated
+4
(µV/V)/K
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January 22, 2016
Parameter
Symbol
CMR
Min
30%
1
Typ. Max
70%
Unit
1.2.1.17.
1.2.1.18.
Common mode input voltage range
VDDE
ms
Waiting time after enabling EEPROM charge pump
clock
tVPP-RISE
1)
2)
RTHJA = 160 K/W assumed.
With reduced performance.
1.3. Electrical Parameters
The following electrical specifications are valid for the operating conditions as specified in table 1.2
(TA = -40°C to 160°C).
1.3.1.
ZSSC5101 Characteristics
Table 1.3 Electrical Characteristics
Parameter
Symbol
Min
Typ.
Max
Unit
1.3.1.1.
Leakage current at VSINP, VSINN, VCOSP, and
VCOSN pins
IIN-LEAK
1
µA
1.3.1.2.
1.3.1.3.
1.3.1.4.
1.3.1.5.
1.3.1.6.
1.3.1.7.
Leakage current at VOUT in high-impedance state
Leakage current difference Vsinp/n, Vcosp/n 1)
Current consumption
IOUT-LEAK
IIN-DIFF-LEAK
ISUPPLY
IPEAK
-12
+12
35
7
µA
nA
mA
mA
V
Peak current consumption at startup 1) 2)
10
4.2
1.8
Sensor supply voltage
VDDS
3.8
1.5
4
Internal digital master clock frequency
(after calibration)
fDIGITAL
1.6
MHz
1)
2)
Maximum characterized on samples, not measured in production.
ZSSC5101 can start with such a peak current for ramps of the power supply with a rise-up time > 100 µs.
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January 22, 2016
1.3.2.
Input Stage Characteristics
Table 1.4 Input Stage Characteristics
Parameter
Symbol
CMRR
Conditions
Min
Typ.
Max
Unit
1.3.2.1.
1.3.2.2.
1.3.2.3.
1.3.2.4.
1.3.2.5.
Common mode
rejection ratio
Input frequency < 100Hz
60
dB
Input preamp offset
voltage drift
TCVD-IN-OFFSET With chopped amplifier
5
µV/K
LSBADC
ppm
Input stage offset
INPOFFSET
DNLADC
Referenced to ADCaverage
register
±32
Input differential
nonlinearity
±2 LSB at 12-bit ADC
±500
±500
(guaranteed monotony) 1)
Input integral
nonlinearity
INLINPUT
Half input range
ppm
±2 LSB at 12-bit ADC
1.3.2.6.
Output referred noise
Full range input
16
LSB eff
Referenced to ADC steps
after average (16-bit
ADCaverageSin register) 1)
1.3.2.7.
1.3.2.8.
1.3.2.9.
1.3.2.10.
Gain low
(programmable)
17.8
35.6
18
36
18.2
36.4
0.6
Gain high
(programmable)
Gain matching between
high and low gain
%
Input noise voltage
density
At bandwidth < 5kHz
100
nV/sqrt(Hz)
1)
Refer to the ZSSC5101 Application Note – Programming.
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January 22, 2016
1.3.3.
Digital Calculation Characteristics
Table 1.5 Digital Calculation Characteristics
Parameter
Symbol
RESINPUT
RESOFFSET
Condition
Min
Typ.
12
Max
Unit
bit
1.3.3.1.
1.3.3.2.
Input stage resolution
Resolution at offset
measurement
14
bit
1.3.3.3.
1.3.3.4.
1.3.3.5.
1.3.3.6.
CORDIC calculation
length
16
bit
bit
bit
CORDIC accuracy for
angle value
13
10
CORDIC accuracy for
magnitude value
Channel switching
frequency (i.e., the
ADC conversion time)
fADC
1/16
1/32
fDIGITAL
fDIGITAL
With average16not8 bit field
in eep_ctrl_manu register 1)
set to ‘0’
1.3.3.7.
1.3.3.8.
Update rate of VOUT
fUPDATE
tSKEW
2
3.125
1
kHz
Channel time skew
1/fADC
between sampling of sine
and cosine channels
1.3.3.9.
Digitally programmable
output angular range
aMAX
AMR sensors
GMR, TMR
5
180
° mech
° mech
° mech
10
360
1.3.3.10.
Angular resolution
AMR sensors
0.022
0.04
Vout = 5 to 95% VDDE
GMR, TMR
0.044
0.08
° mech
Vout = 5 to 95% VDDE
1.3.3.11.
Zero point adjustment
range
AMR sensors
GMR, TMR
0
0
180
360
° mech
° mech
(digitally programmable)
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January 22, 2016
Parameter
Symbol
Condition
Min
Typ.
Max
95
Unit
1.3.3.12.
1.3.3.13.
1.3.3.14.
Upper output clamping
level
VCLAMP-HIGH Max. digital DAC value
4864, fixed resolution (see
RESCLAMP below)
40
%VDDE
Lower output clamping
level
VCLAMP-LOW Min. digital DAC value 256,
fixed resolution
5
30.5
%VDDE
(see RESCLAMP
)
Resolution of clamping
levels
RESCLAMP
1 / 5120
VDDE
(1/4608
of output
range)
(digitally programmable)
1.3.3.15.
DAC resolution
RESDAC
1 / 5120
VDDE
(0.02% of
VDDE)
1)
Refer to the ZSSC5101 Application Note – Programming.
1.3.4.
Analog Output Stage Characteristics (Digital to VOUT)
Table 1.6 Analog Output Stage Characteristics
Parameter
Symbol
Condition
Min
Typ. Max
Unit
1.3.4.1.
1.3.4.2.
Output voltage range
VOUT
At full supply working range
4.5 V < VDDE < 5.7 V
5
95
%VDDE
Error of upper and lower
clamping level 1)
-0.18
0.18
%VDDE
1.3.4.3.
1.3.4.4.
Output offset
Chopped output
±5
±2
LSBDAC
LSBDAC
Differential nonlinearity of
DAC
DNLDAC Guaranteed monotony
1.3.4.5.
1.3.4.6.
Integral nonlinearity of DAC
Output current
INLDAC
±3.9
3
LSBDAC
mA
IOUT
Analog output in Normal
Operating Mode
Output current limit 2)
IOUT-LIMIT Analog output
20
mA
1.3.4.7.
1)
2)
Can be digitally compensated during calibration.
Overwrite-able for entering the Command Mode. See section 2.3.
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January 22, 2016
1.3.5.
Analog Input to Analog Output Characteristics (Full Path)
Table 1.7 Full Analog Path Characteristics
Parameter
Symbol
Condition
Min
Typ.
Max
Unit
1.3.5.1.
1.3.5.2.
Output voltage
temperature drift
VOUT-TEMP-DRIFT For full angular range
including complete function
1.6
mV
Overall linearity
error
INLALL
Full mechanical input range 1)
±0.18
% VDDE
5% to 95% VDDE output
range
8.2 LSB of DAC, orthogonal
analog input to analog output
1.3.5.3.
1.3.5.4.
Output voltage noise
VNOISE-OUT
tPROP-DELAY
With external low pass filter
fC = 0.7kHz
1.3
1.8
mVeff
ms
Propagation delay
time to 90% output
level change
45°mech step for AMR,
90°mech step for GMR;TMR
1.3.5.5.
Power-on time
tON
Time until first valid data on
VOUT after
VDDE > VPW-ON (see
specification 1.3.7.2)
256
1/fDIGITAL
ms
5
1)
Corresponds to 180° mechanical range for AMR sensors or 360° for GMR, TMR sensors.
1.3.6.
Digital Interface Characteristics (CMOS compatible)
Table 1.8 gives the digital signal levels during one-wire interface (OWI) communication.
Table 1.8 Digital Interface Characteristics
Parameter
Input HIGH level
Input LOW level
Output HIGH level
Output LOW level
Switching level
Symbol
VIN-HIGH
Condition
Min
Typ.
Max
Unit
VDDE
VDDE
VDDE
VDDE
VDDE
%VDDE
1.3.6.1.
1.3.6.2.
1.3.6.3.
1.3.6.4.
1.3.6.5.
1.3.6.6.
75%
VIN-LOW
25%
VOUT-HIGH
VOUT-LOW
VSWITCH
IOUT-HIGH = 2mA
90%
10
IOUT-LOW = 2mA
10%
16
50%
Hysteresis of Schmitt-triggers VOUT-ST-HYST
on VOUT pin
Centered around VSWITCH
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January 22, 2016
1.3.7.
Supervision Circuits
See section 2.4 for details for specifications in Table 1.9 that are related to power-up/power-down characteristics.
Table 1.9 Supervision Circuits
Parameter
Symbol
tCODE
Condition
Min
Typ. Max
Unit
1.3.7.1.
Time to enter Command
Mode 1)
Start-up sequence
16
20
26
ms
Power watch on-level 2)
Power watch off-level 3)
Hysteresis on/off
VPW-ON
VPW-OFF
VHYST
4.05
3.9
4.30
4.2
4.45
4.3
V
V
1.3.7.2.
1.3.7.3.
1.3.7.4.
VHYST
=
100
350
mV
VPW-ON – VPW-OFF
Power-on level 4)
VON
2.4
2.7
3.3
4%
V
1.3.7.5.
1.3.7.6.
1.3.7.7.
Lower diagnostic range
Upper diagnostic range
VDIAG-LOW
VDIAG-HIGH
Fixed as DAC value 96
VDDE (min)
VDDE (min)
Fixed as DAC value
5024
96%
1)
2)
3)
4)
After power-on, device checks for correct signature until tCODE expires.
If VDDE is above this level, VOUT is on in Normal Operating Mode.
If VDDE is below this level, VOUT is set to the defined Diagnostics Mode.
If VDDE is equal to or below this level, VOUT is in reset state or diagnostics LOW state (see Table 2.1).
1.3.8.
Power Loss Circuit
Table 1.10 Power Loss Circuit
Parameter
Symbol
Condition
Min
Typ. Max
200
Unit
1.3.8.1.
Output impedance at VOUT
for power loss
RP-LOSS
VDDE – VSSE < 0.7V
Ω
Corresponds to
diagnostics range for
pull-up/pull-down ≥ 5kΩ
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January 22, 2016
2
Circuit Description
2.1. Overview
The ZSSC5101 is a sensor signal conditioner and encoder for magnetoresistive sensor bridges. In a typical set-
up for rotational or linear motion, the sensor bridges provide two sinusoidal signals, which are phase-shifted by
90° (Vsin and Vcos). The ZSSC5101 converts these two signals into a linear voltage ramp, proportional to the
rotation angle or linear distance by means of a CORDIC (Coordinate Rotation Digital Computer) algorithm.
The output voltage VOUT (see specification 1.3.4.1) is ratiometric to VDDE; the typical supply voltage is 5V ±10%.
Using the ZSSC5101’s one-wire interface (OWI), a sensor assembly containing an xMR sensor bridge and the
ZSSC5101 can be connected to a host controller by means of just three wires:
•
•
•
VDDE (4.5 to 5.5V)
VOUT (sensor output and programming input)
VSSE (ground)
The VOUT pin is used for sensor output, programming, and diagnostics for the ZSSC5101 through the OWI (see
section 2.3). All parameters are stored in a nonvolatile memory (EEPROM) and can be read and re-programmed
by the user.
By using the output pin for programming, no additional wires are required to calibrate the sensor. This facilitates
in-line programming and re-programming of fully assembled sensor modules.
The ZSSC5101 also provides failure mode detection, such as broken supply or broken ground detection. In
Normal Operating Mode, the output voltage ranges from ≥5% VDDE to ≤95% VDDE. Both clamping levels are
programmable (see specifications 1.3.3.12 and 1.3.3.13).
In the case of failure detection, the output voltage will be outside the normal operating range (<4%VDDE and
>96%VDDE).
2.2. Functional Description
Figure 2.1 provides the block diagram for the ZSSC5101. See section 11 for the definitions of the abbreviations.
Figure 2.1 ZSSC5101 Block Diagram
VDDE
Digital Signal Processing and Control
VDDS
VDDS
VSSS
One-Wire
Interface
Sin
VSSS
Power Supply Regulators
EEPROM
VSINP
VSINN
VCOSP
VCOSN
Cordic
Algorithm
Buffer
Amp.
VOUT
VDDS
VSSS
MUX
PGA
ADC
DAC
Cos
Analog Frontend AFE
Interface
VSSE
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January 22, 2016
The ZSSC5101 is supplied by a single supply voltage VDDE of 5V ±10%. Internal low-dropout linear voltage
regulators (LDOs) generate the required analog and digital supply voltages as well as the supply voltage for the
sensor bridge, VDDS.
The ZSSC5101 accepts fully differential signals from both sine and cosine sensor bridges. These signals are
connected to the VSINP, VSINN pins and the VCOSP, VCOSN pins, respectively.
Both sine and cosine signals are then multiplexed, sequentially pre-amplified, and sampled by a 12-bit ADC. The
xMR COS/SIN-bridge circuitry is alternately sampled at a frequency of ~200kHz to ensure an identical signal
conversion in both sine and cosine paths.
Following data conversion, the digital sine and cosine values representing X and Y rectangular coordinates are
converted into their respective polar coordinates, phase, and magnitude by means of coordinate transformation
using a CORDIC algorithm.
Phase information ranges from 0 to 2π, which is equivalent to one full wave of the input signal. This information
is further used to calculate the analog output voltage, depending on the user-programmable settings, such as
zero position or angle range. See section 4.3 for further details.
The magnitude information is equivalent to the strength of the input signal (Vpeak). This information is further
used to determine a “magnet loss” error state. See section 2.6 for further details.
Based on the calculated phase information and the user-programmed zero, slope, and clamping parameters, the
corresponding output values are calculated and routed to the DAC input. The DAC output is driven by a buffer
amplifier and routed to the output pin VOUT.
2.3. One-Wire Interface and Command Mode (CM)
In Normal Operating Mode (NOM), the VOUT pin is a buffered, analog output, providing an output voltage
equivalent to the sensor input signals.
Because the same pin is used for programming via the OWI, a specific sequence is required to put the ZSSC5101
into command / programming mode (CM):
•
•
After power-on, the circuit starts in NOM and provides a valid output signal after t_on.
In parallel, the ZSSC5101 monitors the VOUT pin for a valid signature command from the programming
system to enable the Command Mode (authorization). Therefore, the programming system must be able to
overdrive the output buffer with a driver strength greater than IOUT-LIMIT (see 1.3.4.7).
•
•
•
•
The ZSSC5101 can only be unlocked by receiving a predefined user-programmable signature. This
signature is stored in the EEPROM in a write-only register.
If CM is active, the output buffer is switched to high impedance and communication over the one-wire
interface is enabled.
The time frame to enter CM with a valid signature command is limited to tCODE, but it is always open in
Diagnostics Mode (see section 2.6).
Digital data transmission over the one-wire-interface bus is accomplished using PWM-coded signals. For
further information on the OWI protocol, please contact IDT technical support (see contact information on
page 28).
13
January 22, 2016
2.4. Power-Up/Power-Down Characteristics
Table 2.1 describes the behavior of the ZSSC5101 during ramp-up and ramp-down of the power supply voltage
DDE. See Table 1.7 and Table 1.9 for the timing and voltage specifications. In each condition, the ZSSC5101 is in
V
a defined state, which is a substantial feature for safety-critical applications.
Table 2.1 Output Modes during Power-Up and Power-Down
VDDE Voltage
Description
Range [V]
Behavior at VOUT
0.0 to 1.5
The ZSSC5101 is in reset state.
Active driven output to a voltage level
between 0 and VDDE/2
1.5 to 2.5
2.5 to 4.2
VOUT is driven to LOW state.
Diagnostics LOW level
If VDDE > VON, the power-on reset is released and all modules Diagnostics Mode (see section 2.6)
are activated.
4.2 to 4.5
If VDDE> VPW-ON, VOUT is turned on after tON and drives the
last calculated angle value from the DAC. If VDDE < VPW-OFF,
the ZSSC5101 enters Diagnostics Mode; however, brief
voltage drops are ignored.
Analog output with reduced accuracy
4.5 to 5.7
Normal operation range.
Normal Operation Mode
Analog output with specified accuracy
2.5. Power Loss / GND Loss
2.5.1. Purpose
In NOM, the output voltage of the ZSSC5101 is within the range of 5%VDDE ≤ VOUT ≤ 95% VDDE.
In the event of a loss of VDDE or VSSE, for example due to a broken supply wire, the output voltage VOUT will
be driven into the diagnostics range, which is a voltage level outside of the normal operating range. This makes a
power loss easily identifiable by the host controller.
The diagnostic levels are defined as
•
•
Diagnostics LOW level: VOUT <= 4% VDDE; see specification 1.3.7.6
Diagnostics HIGH level: VOUT >= 96% VDDE; see specification 1.3.7.7
2.5.2.
Power Loss Behavior
In order to ensure that the output can be safely driven to the Diagnostics Mode levels, a pull-up or pull-down
resistor ≥ 5kΩ must be connected at the receiving side of the VOUT signal.
Table 2.2 Power Loss Behavior
External Resistor
Pull-Up ≥ 5kΩ
VDDE Loss
VSSE Loss
Diagnostics LOW level
Diagnostics HIGH level
Pull-Down ≥ 5kΩ
14
January 22, 2016
2.6. Diagnostics Mode (DM)
In addition to the power loss indication described above, the ZSSC5101 also indicates other error states by
switching the output VOUT into Diagnostics Mode. These errors are described in Table 2.3.
Table 2.3 Diagnostics Mode
Error Source
Error Condition
Error De-activation
Loss of input signal
Loss of magnet; magnitude is below a
pre-programmed threshold
Magnitude must be above the threshold;
power-on reset
EEPROM
EEPROM
DAC
CRC error
Power-on reset
EEPROM read failure
No valid DAC values
Power-on reset
Valid DAC values are available
Supply voltage
Low VDDE; VDDE < VPW-OFF
see specification 1.3.7.3
;
VDDE > VPW-ON; see specification 1.3.7.2
The state of the Diagnostics Mode is programmable in the EEPROM, it has the following options:
•
•
•
Diagnostics LOW level
Diagnostics HIGH level
High impedance (in this setting, external pull-up or pull-down resistors must be connected to VOUT)
15
January 22, 2016
3
EEPROM
The ZSSC5101 contains a non-volatile EEPROM memory for storing manufacturer codes and calibration values
as well as user-programmable data. Access to the EEPROM is available over the output pin VOUT by using IDT’s
one-wire interface (see section 2.3).
3.1. User Programmable Parameters in EEPROM
Table 3.1 shows the user accessible settings of the EEPROM. These settings are used to adjust the analog
output VOUT to the mechanical movement range and provide space for a user-selectable identification number.
Table 3.1 EEPROM — User Area
Function
Zero angle
Description
Mechanical zero position
Magnet loss
Threshold that defines when the magnet loss error diagnostic state is turned on/off
Multiplication factor for determining the slope of the analog output
Angular range slope
Clamp low and high
Upper and lower clamping levels when the mechanical angle is at the minimum, maximum, or
outside of the normal operation range
User ID
32-bit user-selectable identification number
Clamp switch angle
Slope direction
PGA gain
Angle position at which the output changes the clamping level state
Rising or falling slope of output voltage vs. rotation; clockwise or counterclockwise operation
Input preamplifier gain: low/high
Diagnostics Mode
VOUT state in Diagnostics Mode: LOW, HIGH, or high impedance
For detailed information about EEPROM programming and register settings, refer to the ZSSC5101 Application
Note – Programming.
3.2. CRC Algorithm
EEPROM data is verified by implementing an 8-bit cyclic redundancy check (CRC).
3.3. EDC Algorithm
The EEPROM is protected against bit errors through an error detection and correction (EDC) algorithm. The
protection logic corrects any single-bit error in a data word and can detect all double-bit errors. A single-bit error is
corrected, and the ZSSC5101 continues in Normal Operating Mode. On detection of a double-bit error, the
ZSSC5101 enters the Diagnostics Mode.
16
January 22, 2016
4
Application Circuit Examples
4.1. Typical Application Circuit for AMR Double Wheatstone Sensor Bridges
Figure 4.1 ZSSC5101 with AMR Sensor Bridge
AMR Sensor Bridge
e.g. Sensitec AA747
1
VCC
VDDS
3
+VO2
VSINP
+5V
10
Load
Circuit
5
VDDE
VOUT
VSSE
VSINN
CB
100nF
-VO2
+VO1
12
11
2
6
VCOSP
VCOSN
Rout
Cout
4
GND
-VO1
VSSS
The circuit diagram in Figure 4.1 shows a typical application for the ZSSC5101 with an AMR double Wheatstone
sensor bridge. Due to the nature of AMR sensors, the periodicity of these sensor signals is 180 mechanical
degrees.
The sensor bridges are mechanically rotated by 45° from each other, providing differential output signals that are
90 electrical degrees apart. The ZSSC5101 converts these sine and cosine signals into a linear output voltage
with a programmable full-scale angle range from 0° to 5° up to 0° to 180° with a resolution of 0.022° to 0.04° per
step (see specification 1.3.3.10). The ZSSC5101 accepts sensor signals with a sensitivity up to ±23mV/V (see
specification 1.2.1.14), which is sufficient for a typical AMR sensor bridge. No external components are required
at the sensor inputs.
17
January 22, 2016
4.2. Typical Application Circuit for TMR Sensor Bridges
Figure 4.2 ZSSC5101 with TMR Sensor Bridge
TMR Sensor Bridge
e.g. MDT MMA253F
1
VCC
VDDS
Rs
3
X+
VSINP
+5V
10
12
Load
Circuit
Rp
VDDE
Rs
Rs
CB
100nF
X-
5
2
VSINN
VOUT
VSSE
Y+
Rout
Cout
VCOSP
11
Rp
Rs
6
4
VCOSN
VSSS
GND
Y-
Rs=51k
Rp = 5k
Ω
Ω
to 10kΩ
The circuit diagram in Figure 4.2 shows a typical application for the ZSSC5101 with two TMR sensor bridges.
TMR and GMR sensors have a periodicity of 360 mechanical degrees; therefore this configuration can be used to
measure the absolute angle of a full mechanical turn.
The sensor bridges are mechanically rotated by 90° from each other, providing differential output signals that are
90 electrical degrees apart. The ZSSC5101 converts these sine and cosine signals into a linear output voltage
with a programmable full-scale angle range from 0° to 10° up to 0° to 360° with a resolution of 0.044° to 0.08° per
step (see specification 1.3.3.10). As a TMR sensor bridge has a much higher sensitivity than an AMR Sensor (up
to 2 orders of magnitude), a resistive divider consisting of 2x Rs and Rp is added to each sensor input channel
(sin, cos) of the ZSSC5101 to match the sensor bridge with the ZSSC5101 inputs.
For best temperature compensation, Rs and Rp should have the same temperature coefficient TC and routed
close together on the same printed circuit board (PCB).
4.3. Mechanical Set-up for Absolute Angle Measurements
Figure 4.3 shows a typical set-up for an absolute rotation angle measurement. A diametrically magnetized magnet
is mounted at the end of a rotating shaft with a specific gap. The rotation axis of the magnet is centered over the
xMR sensor (see sensor manufacturer’s data sheet for exact location). Depending on the maximum angle to be
measured, the sensor can be either an AMR sensor with a maximum absolute angle of 180° or a TMR/GMR
sensor with a maximum absolute angle of 360° (see 4.1 and 4.2 for further details).
The ZSSC5101 converts the sine and cosine signals generated by the xMR sensor bridge into a linear ramp that
is proportional to the rotation angle.
The gap between magnet and sensor is determined by the strength of the magnet and the type of sensor.
Stronger magnets allow larger air gaps, and due to their higher sensitivity, TMR sensors allow larger air gaps than
AMR sensors. The air gap should be chosen such that the sensor output signal remains undistorted and
sinusoidal.
18
January 22, 2016
In order to adjust the linear ramp to the mechanical angle range, the ZSSC5101 provides several programmable
parameters. These parameters are stored in an on-chip EEPROM and can be re-programmed by the user (see
Figure 4.3):
•
•
•
•
•
•
Zero angle position: aligns the mechanical zero position to the electrical zero position
Maximum angle position: matches the full stroke of the ramp to the mechanical angular range
Clamp switch angle: defines the angle position where the output voltage returns from Vout,max to Vout,min
Maximum output voltage, upper clamping level Vout,max
Minimum output voltage, lower clamping level Vout,min
Ramp direction: rising or falling ramp
Figure 4.3 Mechanical Set-up for Rotational Measurements and Programming Options
Full turn operation (TMR)
Ferrite or
rare earth magnet
Vout
95%
5%
0
180
360° angle
Adjustable angle range and clamp
levels
Vout
2
3
4
+5V
Vout
95%
6
5
xMR sensor
ZSSC5101
5%
1
0°
180°
360°
angle
= programmable options
19
January 22, 2016
4.4. Mechanical Set-up for Linear Distance Measurements
Figure 4.4 shows a typical set-up for a linear distance measurement. The xMR sensor provides a sinusoidal
signal that is proportional to the length of a magnetic pole (AMR) or to the length of a magnetic pole pair (TMR).
The graph shown below shows a setup for an AMR sensor (e.g., Sensitec AA700 family; www.sensitec.com,
Measurement Specialties KMT series, www.meas-spec.com).
As the magnet is moving on a linear path, one output ramp is generated with each pole; hence an absolute linear
distance measurement is possible within the length of one pole:
Vout −Vout,min
absolute _ position = LP *
Vout,max −Vout,min
where: LP =
VOUT
pole length of the sensor magnet
output voltage of the ZSSC5101
=
V
,
OUT max =maximum output clamping voltage of ZSSC5101 ( programmable; e.g. 95% VDD)
V
,
OUT min = minimum output clamping voltage of ZSSC5101 ( programmable; e.g. 5% VDD)
Longer linear distances can be measured by using multi-pole magnetic strips and by counting the number of
ramps from a defined home position. Each full ramp (VOUT min to VOUT max) corresponds to the length of one
magnetic pole.
,
,
Figure 4.4 Mechanical Set-up for Linear Distance Measurements and Programming Options
Vout
95%
Dipole or
multi-pole magnet
5%
0
1LP
2 LP distance
+5V
Vout
xMR sensor
ZSSC5101
20
January 22, 2016
4.5. Input-to-Output Characteristics Calculation Examples
Figure 4.5 shows a detailed view of the possible settings for clamping levels, zero position, ramp slope, and
clamp switch angle.
The total output range VOUT from 0 to 100% VDDE is 5120 DAC steps.
In the normal operating range (5 to 95% VDDE), the DAC output can range from 256 to 4864, allowing 4608 steps
(12.17bit) for the analog output voltage.
The full-scale angular range is 180° for AMR sensors and 360° for GMR and TMR sensors. Consequently, the
full-scale angular step resolution is
180°/4608 = 0.039 mechanical degrees for AMR sensors and
360°/4608 = 0.078 mechanical degrees for GMR and TMR sensors
Smaller angular ranges result in a finer angular step resolution. The smallest angle step is 0.022° (= 180°/8192).
For example, a total stroke of 30° (e.g., in a pedal application) will yield the following results:
30°/0.022° = 1365 steps (using an AMR sensor)
Figure 4.5 Input-to-Output Characteristics with Parameters
Ouput voltage (%VDDE
)
5120
100%
95%
4864
clamp_switch_angle
VCLAMP-HIGH
2048
1562
40%
30.5%
VCLAMP-LOW
256
5%
0
0°
180°
(360°)
mechanical
angle
zero_angle
angular_range
21
January 22, 2016
5
ESD and Latch-up Protection
5.1. Human Body Model
The ZSSC5101 conforms to standard MIL-STD-883D Method 3015.7, rated at 4000V, 100pF, 1.5kΩ according to
the Human Body Model. This protection is ensured at all external pins (VOUT) including the device supply
(VDDE, VSSE). ESD protection on all other pins (VDDS, VSSS, VSINP, VSINN, VCOSP, VCOSN) is up to
2000V.
5.2. Machine Model
The ZSSC5101 conforms to standard EIA/JESD22-A115-A, rated at 400V, 200pF, and 0kΩ according to the
machine model. This protection is ensured at all external pins (VOUT) including device supply (VDDE, VSSE).
ESD protection on all other pins (VDDS, VSSS, VSINP, VSINN, VCOSP, VCOSN) is up to 200V.
5.3. Charged Device Model
The ZSSC5101 conforms to standard AEC Q100 (Rev. F) and EIA/JESD22/C101, rated at 750V for corner pins
and 500V for all other pins (class C3B) according to the Charge Device Model. This protection is ensured at all
external pins,
5.4. Latch-Up
The ZSSC5101 conforms to EIA/JEDEC Standard No. 78.
22
January 22, 2016
6
Pin Configuration and Package Dimensions
The ZSSC5101 is available in a SSOP14 green package or as bare die.
Table 6.1 Pin Configuration
Pin No
Die
Pin No
Pin
Name
Description
Notes
SSOP-14
1
2
3
4
10
11
12
1
VDDE
Positive analog supply voltage
Negative analog supply voltage
Analog output/one-wire interface (OWI)
Positive sensor supply voltage
Positive supply voltage, 5V ±10%
VSSE
VOUT
VDDS
Negative supply voltage, must connect to GND
Positive sensor signal cosine channel
input
5
2
VCOSP
Positive sensor signal sine channel
input
6
7
8
3
4
5
VSINP
VSSS
VSINN
Negative sensor supply voltage
Negative sensor signal sine channel
input
Negative sensor signal cosine channel
input
9
6
VCOSN
7
8
N.C.
Unconnected pin
Factory test pin
Unconnected pin
Unconnected pin
Factory test pin
Must be left open
Must be left open
Must be left open
Must be left open
Must be left open
TEST
N.C.
9
13
14
N.C.
TEST
23
January 22, 2016
6.1. Package Drawing – SSOP-14
The SSOP-14 package is a delivery option for the ZSSC5101. The package dimensions based on the JEDEC
JEP95: MO-150 standard illustrated in Figure 6.1.
Figure 6.1 Package Dimensions – SSOP-14
Weight
≤0.3g
Package Body Material Low stress epoxy
Lead Material
Lead Finish
Lead Form
FeNi-alloy or Cu-alloy
Solder plating
Z-bends
Dimension
Minimum
1.73
Maximum
1.99
A
A1
A2
bP
c
0.05
0.21
1.68
1.78
0.25
0.38
0.09
0.20
D *
e
6.07
6.33
0.65 nominal
E *
HE
k
5.20
7.65
0.25
0.63
0°
5.38
7.90
LP
θ
10°
* Without mold-flash
24
January 22, 2016
Figure 6.2 Pin Map and Pad Position of the ZSSC5101 SSOP-14 Package
VDDS
VCOSP
VSINP
VSSS
TEST
N.C.
1
2
3
4
5
6
7
14
13
12
11
10
9
Package SSOP-14
Package marking codes:
VOUT
vv
Version code
yymm Manufacturing date:
yy = last two digits of year
mm = two digits for month
VSSE
VDDE
N.C.
VSINN
VCOSN
N.C.
R
indicates RoHS compliance
TEST
8
6.2. Die Dimensions and Pad Coordinates
Die dimensions and pad coordinates are available on request in a separate document. See section 10.
7
Layout Requirements
Recommendation: Keep the traces between the xMR sensor and the ZSSC5101 (VDDS, VSSS, VSINP, VSINN,
VCOSP, and VCOSN pins) as short as possible. Additional resistors for using TMR sensors (see Figure 4.2)
should have the same temperature coefficient TC and be routed close together on the same PCB.
8
Reliability and RoHS Conformity
The ZSSC5101 is qualified according to the AEC-Q100 standard, operating temperature grade 0.
The ZSSC5101 complies with the RoHS directive and does not contain hazardous substances.
The complete RoHS declaration update can be downloaded at www.IDT.com.
25
January 22, 2016
9
Ordering Information
Sales Code
ZSSC5101BE1B
Description
Delivery Package
ZSSC5101 Die – Temperature range: -40°C to +160°C
ZSSC5101 Die – Temperature range: -40°C to +160°C
ZSSC5101 Die – Temperature range: -40°C to +160°C
8” tested wafer, unsawn, thickness = 390 ±15µm
8” tested wafer, unsawn, thickness = 725 ±15µm
8” tested wafer, unsawn, thickness = 250 ±15µm
8” tested wafer, sawn on frame, thickness = 390 ±15µm
ZSSC5101BE2B
ZSSC5101BE3B
ZSSC5101BE1C ZSSC5101 Die – Temperature range: -40°C to +160°C
ZSSC5101BE4R ZSSC5101 SSOP-14 – Temperature range: -40°C to +150°C 13” tape and reel
ZSSC5101BE4T
ZSSC5101 KIT
ZSSC5101 SSOP-14 – Temperature range: -40°C to +150°C Tube
ZSSC5101 Evaluation Kit including USB Communication Board, ZSSC5101 AMR board, adapters. Software can be
downloaded from www.IDT.com/ZSSC5101 after free customer login, which is described in section 10 (see the
ZSSC5101 Evaluation Kit and GUI Description for details).
10 Related Documents
Document
ZSSC5101 Feature Sheet
ZSSC5101 Evaluation Kit and GUI Description *
ZSSC5101 Technical Note – Die Dimensions **
ZSSC5101 Application Note – Programming **
Visit the ZSSC5101 product page www.IDT.com/ZSSC5101 or contact your local sales office for the latest version
of these documents.
*
Note: Documents marked with an asterisk (*) require a free customer login account.
** Note: Documents marked with two asterisks (**) are available only on request.
26
January 22, 2016
11 Glossary
Term
AFE
Description
Analog Frontend
AMR
CM
Anisotropic Magnetoresistance
Command Mode
CORDIC
DAC
DM
Coordinate Rotation Digital Computer
Digital-to-Analog Converter
Diagnostic Mode
EDC
GMR
INL
Error Detection and Correction
Giant Magnetoresistance
Integral Nonlinearity
LDO
MUX
NOM
OWI
PCB
THJA
TMR
Low-Dropout Linear Voltage Regulators
Multiplexer
Normal Operating Mode
One-Wire Interface
Printed Circuit Board
Junction to Ambient Thermal Resistance
Tunnel Magnetoresistance
27
January 22, 2016
12 Document Revision History
Revision
1.00
Date
Description
August 25, 2014
September 10, 2014
April 13, 2015
First release document
Add package drawing
1.10
1.20
Updates for INLDAC, TMR application schematic, pin names.
Addition of package marking codes in Figure 6.2.
Removal of references to half-bridge applications.
Corrections for step number in section 4.5 and Figure 4.5.
Update for contact information.
Minor edits for clarity.
1.21
1.22
April 17, 2015
April 29, 2015
January 22,2016
Correction for maximum temperature for SSOP-14.
Removal of reference to amplitude calibration on page 1.
Changed to IDT branding.
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