iC-MSA
SIN/COS SIGNAL
preliminar y
Rev A1, Page 1/29
CONDITIONER with AGC and 1Vpp DRIVER
FEATURES
o
PGA inputs for differential and single-ended sensor signals up
to 20 kHz
o
Selectable adaptation to voltage or current signals
o
Flexible signal assignment due to input multiplexers
o
Sine/Cosine signal conditioning for offset, amplitude and
phase
o
Separate index signal conditioning
o
Short-circuit-proof and reverse polarity tolerant output drivers
(1 Vpp to 100
Ω)
o
Stabilized output signal levels due to automatic gain control
o
Signal and system monitoring with configurable alarm output
o
Supply voltage monitoring with integrated switches for
reversed-polarity-safe systems
o
Excessive temperature protection with sensor calibration
o
I
2
C multi-master interface
o
Supply from 4.3 to 5 V, operation within -40 °C to +115 °C
o
Verifyable chip release code
o
Pin compatible with iC-MSB
APPLICATIONS
o
Programmable sensor interface
for optical and magnetic position
sensors
o
Linear gauges and incremental
encoders
o
Linear scales
PACKAGES
TSSOP20-TP
BLOCK DIAGRAM
VDDS
GNDS
VDD
REVERSE POLARITY
PROTECTION
GND
SCL
SERIAL I2C
INTERFACE
CONFIGURATION
REGISTER
MONITORING
SDA
iC-MSA
CALIBRATION
Tw Toff
ERR
PwrOn
PGA INPUT
X1
X2
X3
X4
X5
X6
I/V
SIGNAL PATH MUX
x
CH0
AUTOMATIC GAIN
CONTROL
ANALOG DRIVER
OUTPUT
PZ
NZ
PC
-
I/V
x
x
CH2
I/V
-
x
-
+
x
NC
I/V
x
x
CH1
+
-
PS
ADJ
I/V
I/V
x
x
NS
Copyright © 2013 iC-Haus
http://www.ichaus.com
iC-MSA
SIN/COS SIGNAL
preliminar y
Rev A1, Page 2/29
CONDITIONER with AGC and 1Vpp DRIVER
DESCRIPTION
iC-MSA is a signal conditioner with line drivers for
sine/cosine sensors which are used to determine po-
sitions in linear and angular encoders, for example.
Programmable instrumentation amplifiers with se-
lectable gain levels permit differential or referenced
input signals; at the same time the modes of op-
eration differentiate between high and low input
impedance. This adaptation of the iC to voltage or
current signals enables MR sensor bridges or photo-
sensors to be directly connected up to the device.
The integrated signal conditioning unit allows signal
amplitudes and offset voltages to be calibrated accu-
rately and also any phase error between the sine and
cosine signals to be corrected. Separate zero signal
conditioning settings can be made for the gain and
offset; data is then output either as an analog or a
differential square-wave signal (low/high level analo-
gous to the sine/cosine amplitude).
For the stabilization of the output levels a signal is
generated from the conditioned and calibrated input
signals which controls the gain of all channels. Tem-
perature and aging effects can be compensated for
and the set signal amplitude is maintained with ab-
solute accuracy. At the same time the control cir-
cuitry monitors both whether the sensor is functioning
correctly and whether it is properly connected; signal
loss due to wire breakage, short circuiting, dirt or ag-
ing, for example, is recognized when control thresh-
olds are reached and indicated at alarm output ERR.
iC-MSA is protected against a reversed power supply
voltage; the integrated voltage switch for loads of up
to 20 mA extends this protection to cover the overall
system. The analog output drivers are directly cable-
compatible and tolerant to false wiring; if supply volt-
age is connected up to these pins, the device is not
destroyed.
The device configuration and calibration parameters
are CRC protected and stored in an external EEP-
ROM; they are loaded automatically via the I2C in-
terface once the supply voltage has been connected
up.
iC-MSA
SIN/COS SIGNAL
preliminar y
Rev A1, Page 3/29
CONDITIONER with AGC and 1Vpp DRIVER
CONTENTS
PACKAGING INFORMATION
PIN CONFIGURATION TSSOP20-TP . . . .
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS
PROGRAMMING
SERIAL CONFIGURATION INTERFACE
(EEPROM)
Example of CRC Calculation Routine . . . . .
EEPROM Selection . . . . . . . . . . . . . .
I
2
C Slave Mode (ENSL = 1) . . . . . . . . . .
BIAS SOURCE AND TEMPERATURE
SENSOR CALIBRATION
OPERATING MODES
Calibration Op. Modes . . . . . . . . . . . . .
Special Device Test Functions . . . . . . . .
Signal Filter . . . . . . . . . . . . . . . . . . .
TEST MODE
INPUT CONFIGURATIONS
Current Signals . . . . . . . . . . . . . . . . .
Voltage Signals . . . . . . . . . . . . . . . . .
4
4
5
5
6
SIGNAL CONDITIONING CH0
10
Gain Settings CH0 . . . . . . . . . . . . . . .
Offset Calibration CH0 . . . . . . . . . . . . .
13
13
13
14
AUTOMATIC SIGNAL GAIN CONTROL and
SIGNAL MONITORING
ERROR MONITORING AND ALARM OUTPUT
Alarm Output: I/O pin ERR . . . . . . . . . .
15
16
16
16
16
17
18
18
18
Excessive Temperature Warning . . . . . . .
Driver Shutdown . . . . . . . . . . . . . . . .
Error Protocol . . . . . . . . . . . . . . . . . .
REVERSE POLARITY PROTECTION
APPLICATION HINTS
PLC Operation . . . . . . . . . . . . . . . . .
Connecting MR sensor bridges for
safety-related applications . . . . . . . .
Motor feedback encoder with iC-MSA,
iC-MSB and single EEPROM . . . . . .
23
23
23
SIGNAL PATH MULTIPLEXING
SIGNAL CONDITIONING CH1, CH2
Gain Settings CH1, CH2 . . . . . . . . . . . .
Offset Calibration CH1, CH2 . . . . . . . . .
Phase Correction CH1 vs. CH2 . . . . . . . .
20
21
21
22
22
24
25
25
25
25
25
26
27
27
27
28
iC-MSA
SIN/COS SIGNAL
preliminar y
Rev A1, Page 4/29
CONDITIONER with AGC and 1Vpp DRIVER
PACKAGING INFORMATION
PIN CONFIGURATION TSSOP20-TP
PIN FUNCTIONS
No. Name Function
1
2
3
4
5
X1
X2
X3
X4
VDDS
1)
Signal Input 1 (Index +)
Signal Input 2 (Index -)
Signal Input 3
Signal Input 4
Switched Supply Output and Internal
Analog Supply Voltage
(reverse-polarity-proof, load 20 mA
max.)
Switched Ground
(reverse-polarity-proof)
Signal Input 5
Signal Input 6
Not Connected
Serial Configuration Interface,
data line
Serial Configuration Interface,
clock line
Neg. Cosine Output
Pos. Cosine Output
Neg. Sine Output
Pos. Sine Output
Ground
+4.3 V to +5.5 V Supply Voltage
Neg. Index Output
Pos. Index Output
Error Signal (In/Out),
Test Mode Trigger Input
Thermal Pad (TSSOP20-TP)
6 GNDS
1)
7
8
9
10
X5
X6
N.C.
SDA
11 SCL
12
13
14
15
16
17
18
19
20
NC
PC
NS
PS
GND
VDD
NZ
PZ
ERR
TP
2)
1) It is advicable to connect a bypass capacitor of at least 100 nF close to the chip’s analog supply terminals.
2) To improve heat dissipation the
thermal pad
of the package (bottom side) should be joined to an extended copper area which must have GNDS potential.
iC-MSA
SIN/COS SIGNAL
preliminar y
Rev A1, Page 5/29
CONDITIONER with AGC and 1Vpp DRIVER
ABSOLUTE MAXIMUM RATINGS
These ratings do not imply operating conditions; functional operation is not guaranteed. Beyond these ratings device damage may occur.
Item
No.
Symbol
Parameter
Voltage at VDD, GND, PC, NC, PS, NS,
PZ, NZ
Voltage at ERR
Pin-To-Pin Voltage between VDD,
GND, PC, NC, PS, NS, PZ, NZ, ERR
Voltage at X1...X6, SCL, SDA
Current in VDD
Current in VDDS, GNDS
Current in X1...X6, SCL, SDA, ERR,
PC, NC, PS, NS, PZ, NZ
ESD Susceptibility at all pins
Permissible Power Dissipation
Junction Temperature
Storage Temperature Range
HBM 100 pF discharged through 1.5 kΩ
TSSOP20-TP
-40
-40
-0.3
-100
-50
-20
Conditions
Min.
-6
-6
Max.
6
8
6
VDDS +
0.3
100
50
20
2
400
150
150
V
V
V
V
mA
mA
mA
kV
mW
°C
°C
Unit
G001 V()
G002 V()
G003 V()
G004 V()
G005 I(VDD)
G006 I()
G007 I()
G008 Vd()
G009 Ptot
G010 Tj
G011 Ts
THERMAL DATA
VDD = 4.3...5.5 V
Item
No.
T01
T02
Symbol
Ta
Rthja
Parameter
Conditions
Min.
Operating Ambient Temperature Range TSSOP20-TP
Thermal Resistance Chip to Ambient
TSSOP20-TP surface mounted to PCB
according to JEDEC 51
-40
35
Typ.
Max.
115
°C
K/W
Unit
All voltages are referenced to Pin GNDS unless otherwise stated.
All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
stm32/stm8
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