EVAL-ADA4571-2EBZ

EVAL-ADA4571-2 User Guide UG-1047
Rev. 0 | Page 7 of 9
Vsin vs Vcos
The Vsin vs Vcos graph is another way to visualize the electrical
angle from the ADA4571-2. However, there is more information
given in Figure 10, showing the radius of the output values which
can give further diagnostic information to system. As long as
the sensor is fully saturated, or the applied magnetic field strength
exceeds 25 kA/m, the radius value remains unchanged at a constant
temperature. As the AMR effect is smaller at high temperatures
the radius value changes with respect to temperature. See the
ADA4571-2 data sheet for the temperature coefficient values for
the output amplitude for the V
SINx
and V
COSx
channels.
15014-010
Figure 10. Vsin vs Vcos Graph
Digital Inputs
Four digital inputs on the ADA4571-2 can be toggled using the
Digital Inputs buttons.
The power-down button for each channel puts the devices into
a low power state by disabling the internal circuitry for that channel
and placing the outputs into a high impedance mode. See the
ADA4571-2 data sheet for the power-down current per channel
in the device. The power-down function of each channel can be
toggled separately.
The Gain Control 1 Disabled and Gain Control 2 Disabled
buttons put the device into the gain control mode (see Figure 11).
This mode alters bridge supply voltage based on the internal
temperature value of the device.
Through this mode, the output amplitude temperature coefficient
of the ADA4571-2 reduces. See the ADA4571-2 data sheet for
output amplitude vs. temperature with the gain control enabled
and disabled.
15014-011
Figure 11. Digital Inputs Pane
Offset Calibration
An offset calibration is required to maximize the accuracy of
the ADA4571-2. The V
SIN1
, V
COS1
, V
SIN2
, and V
COS2
channels have
inherent voltage offsets due to resistor mismatch within the
AMR sensor bridges. See the ADA4571-2 data sheet offset
voltage ranges for the outputs.
There are a few methods that can null the offsets for the outputs. To
run an offset calibration on Channel 1, click Run Cal CH1 (see
Figure 12). Once clicked, rotate the magnetic stimulus slowly
through an entire mechanical rotation. This ensures the maximum
and minimum output voltages are found for each channel.
15014-012
Figure 12. Offset Calibration Pane
UG-1047 EVAL-ADA4571-2 User Guide
Rev. 0 | Page 8 of 9
EVALUATION BOARD SCHEMATIC AND ARTWORK
15014-013
IDD = 6.4MA (MAX)
POWER REQUIREMENTS
PLACE THESE CAPS BETWEEN
EEPROM ID
MUST NOT BE MORE THAN 0.3V APART
AVDD AND DVDD MUST BE AT SAME POTENTIAL
VOLTAGE AT THIS PIN DETERMINES
WHEN HIGH: ANALOG INPUT RANGE IS 2XVREF
DETERMINGS I/P RANGE OF I/P CHANNELS
PLACE THESE CAPS BETWEEN
LOGIC INPUT
IF TIED TO DGND:
SGL/DIFF:
REF SELECT:
VDRIVE:
RANGE:
LOGIC INPUT
LOGIC INPUT
ON-CHIP 2.5V REFERENCE IS USED
DVDD AND DGND
LOGIC POWER SUPPLY INPUT
THE INTERFACE VOLTAGE
2.7 (VMIN); 5.25 (VMAX)
VA4-VA6 AND VB4-VB6
PLACE THESE CAPS BETWEEN
VDRIVE AND AGND
PLACE AS CLOSE TO DUT AS POSSIBLE
ARE FOR REFERENCE ONLY
AVDD AND AGND
0.1UF
4.99K 4.99K
0.1UF
4.99K 4.99K
0.1UF
0
100K
M24C64-WMN6TP
0.1UF
470000PF
0
0
DNI
131-3701-261131-3701-261
DNIDNI
0.1UF
10UF
AD7266BSUZ
0.1UF
22-03-2031
0.1UF
10UF
0.1UF
10UF
131-3701-261
DNI
0.1UF
22-03-2031
0.1UF
0
33
0.1UF
0.1UF
33
131-3701-261
DNI
DNI
470000PF
22-03-2031
R3R4 R2 R1
VB6
VB5
VB4
VA6
VA5
VA4
R17
R18
P1
P2
C33
U7
R20
C18
C17
C15
C13
U2
C16
C14
C11
C12
TP2
J4
TP1
J3
TP5
J2
TP4
J1
R5
C6
R6
C7
R7
C8
R8
C9
C1
C2
C3
C4
P10
DUT_VDD
VCOS1
GPIO2
EEPROM_A0
SCL_0
VDD_3P3V
DVDD
SDA_0
VCOS2
VDD_3P3V
VBUS
VCOS2VCOS1VSIN1
VCOS2
BRD_SUPPLY
+5V_REG
PD2 GPIO6
DOUTA_BUFF
GC1
GC2
VSIN1
PD1
GPIO0
GPIO4GC2
VSIN2
AVDD
VSIN1
VSIN2
VTEMP1
SGL/DIFF
A0_GPIO1
A1_GPIO3
A2_GPIO5
VDRIVE
VCOS1
VDD_3P3V
VTEMP2
DUT_VDD
GC1
VSIN2
DUT_VDD
CLK_AD7266
CS_SEL_A
RANGEVDD_3P3V
VDD_AD7266
DVDD
AVDD
BRD_SUPPLY
VDD_AD7266
1
1
1
1
1
1
3
2
1
3
2
1
7
4
8
5
6
3
2
1
31
13
14
15
16
17
18
12
11
10
9
8
7
22
27
2
21
32
28
30
29
1
20
4
26
3
19
6
5
23
24
25
1
5432
1
1
5432
1
1
5432
1
1
5432
1
3
2
1
DVDD
VDRIVE
DOUTA
DOUTB
SCLK
CS_N
A0
A1
A2
SGL/DIFF_N
RANGE
DCAPB
VB1
VB2
VB3
VB4
VB5
VB6
VA6
VA5
VA4
VA3
VA2
VA1
AGND
DCAPA
AVDD
REF_SELECT
DGND
LOGIC HIGH SELECS SINGLE ENDED ANALOG INPUTS
93
25
111
6
59
60
54
51
52
49
48
47
46
71
75
74
70
73
72
68
69
64
62
63
61
66
67
43
45
41
42
40
38
39
36
37
35
33
34
32
31
30
28
29
26
84
83
77
88
92
94
90
89
87
86
82
81
80
79
85
76
23
24
22
20
21
18
19
17
16
15
13
14
12
10
11
8
9
7
5
108
107
114
101
110
113
112
115
106
105
104
103
102
100
98
99
97
96
116
4
2
3
1
120
119
118
117
109
95
3.3V/20MA
65
50
27
91
78
44
53
56
55
58
57
33
FX8-120S-SV(21)
10UF
33
FX8-120S-SV(21)
33
10UF
33
33
33
CS
DOUTA
A2
CLK
A1
A0
R14
R12
R13
3.3V
VBUS
C20
R9
R11
R10
C19
P14
P14
EEPROM_A0
A2_GPIO5
DOUTA_BUFF
CS_SEL_A
A1_GPIO3
A0_GPIO1
GPIO3
GPIO0
GPIO2
VBUS
GPIO6
CLK_AD7266
VDD_3P3V
SPI_MISO
GPIO5
GPIO1
SDA_0
SPI_CLK
SPI_SELA
SCL_0
GPIO4
1
1
1
1
1
1
VSS
SCL
SDA
WC_N
E2
E1
E0
VCC
ILOAD = 500MA
VIN RANGE OF 2.6V TO 12V
571-0500
DNI
DNI
0.1UF
27NF
0.1UF
1UF
571-0100
ADA4571-2WHRZ
1UF
ADP3336ARMZ
64.9K
DNI
27NF
210K
DNI
47UF
1N5818
P3
C25
TEMP2
TEMP1
C24
C23
5V
C22
R15R16
U1
C21
P5
D1
C10
C5
U3
+EXT_SUPPLY
DUT_VDD DUT_VDD
VCOS1
VTEMP2
VSIN1
VTEMP1
GC1
GC2
PD2
VSIN2
+EXT_SUPPLY
+5V_REG
VCOS2
PD1
2
1
1
1
1
6
3
2
1
8
7
4
5
2
1
AC
1
9
16
8
3
11
14
6
4
12
15
2
10
7
13
5
GND1
GND1
GND2
GND2
VSIN2
VCOS2
GC2
PD1
VDD1
VTEMP1
VSIN1
VCOS1
GC1
PD2
VDD2
VTEMP2
OUT2
IN
IN1
OUT
OUT1
FB
GNDSD_N
Figure 13. ADA4571-2 Evaluation Motherboard Schematic
EVAL-ADA4571-2 User Guide UG-1047
Rev. 0 | Page 9 of 9
ORDERING INFORMATION
RELATED LINKS
Resource Description
ADA4571-2 Integrated AMR Angle Sensor and Signal Conditioner
ADP3336 High Accuracy Ultralow I
Q
, 500 mA anyCAP® Adjustable Low Dropout Regulator
AD7266 Differential/Single-Ended Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
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UG15014-0-12/16(0)

EVAL-ADA4571-2EBZ

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Magnetic Sensor Development Tools Evaluation Board
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