Si85xx-TB UG
Si85XX UNIDIRECTIONAL AC CURRENT SENSOR TARGET BOARD USER
’
S
GUIDE
The Si85xx products are unidirectional ac current sensors available with full scale current sense input ranges of 5,
10, and 20 A. Si85xx products are ideal upgrades for older current-sensing technologies offering size, performance
and cost advantages over current transformers, Hall Effect devices, DCR circuits, and other approaches. The
Si85xx are extremely low-loss, adding less than 1.3 mΩ of series resistance and less than 2 nH series inductance
in the sensing path at 25 ºC. Current-sensing terminals are isolated from the other package pins to a maximum
voltage of 1,000 VDC.
1. Kit Contents
The Si85xx Unidirectional AC Current Sensor Development Kit contains the following items:
„ 10 Amp Si8512 based evaluation board
„ Si85xx Unidirectional AC Current Sensor Target Board User's Guide (this document)
2. Hardware Overview
The Si85xx Target Board (Si85xx-TB, see Figure 1) provides a means to evaluate the ac current sensor in an
existing application. It is meant to be soldered directly into the users existing power supply. The board comes with
the Si8512 installed and provides a 10 Amp full scale input sense range and a 2.0 V full scale output voltage. For
more details on the Si8512, refer to the Si85xx Data Sheet.
Figure 1. Si85xx-TB Overview
Rev. 0.1 6/07
Copyright © 2007 by Silicon Laboratories
Si85xx-TB UG
Si85xx-TB UG
4. Si85xx Evaluation Board
The Si85xx-TB has a Si8512 installed. Refer to Figure 4 for the locations of the various I/O connectors and major
components.
„ J1
„ J2
„ J3
„ J4
„ J5
„ J6
„ J7
5 V Supply Input power connection 5 V, 100 mA
GND, Input Supply power return connection, 0 V
HDR-2X2, Mode Control input
HDR-2X07, R1, R2, R3, R4 inputs, OUT1, OUT2 outputs, and seven GND return pins
IIN Positive Current Sense Input
IOUT Negative/return Current Sense Input
HEADER, TRST timing select jumper, default tied to VDD
Figure 4. Si85xx-TB Layout
4.1. VIN (J1, J2)
The user-provided power supply should be connected to connectors J1 and J2 where J2 is the reference. The
power source must be 5 V with at least 100 mA maximum output current.
Table 1. J1, J2 Pin Descriptions
Jumper #
Description
5 V, 100 mA
GND
J1
J2
4.2. Mode Pin (J3)
Connector J3 is the Mode Control header. The user should tie this pin to either VDD or GND depending on their
power supply.
Table 2. J3 Pin Descriptions
Jumper #
Description
J3
VDD or GND
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4.3. R1, R2, R3, R4 Inputs, OUT1, OUT2 Outputs (J4)
Connector J4 is used to provide the control inputs (R1, R2, R3, R4, MODE) to the Si85xx. It also provides the
output voltage of the sensed input current on OUT1 and OUT2.
Table 3. J4 Pin Descriptions
Jumper #
Description
J4
R1, R2, R3, R4, OUT1, OUT2, GND
4.4. IIN (J5)
Connector J5 is used to provide the positive current sense input to the Si85xx device.
Table 4. J5 Pin Descriptions
Jumper #
Description
J5
IIN
4.5. IOUT (J6)
Connector J6 is used to provide the negative/return current sense input to the Si85xx device.
Table 5. J6 Pin Descriptions
Jumper #
Description
J6
IOUT
4.6. TRST RESET (J7)
Connector J7 is used to set the timing for the Si85xx's integrator. J7 defaults to Reset option 1 where TRST is tied
VDD providing approximately 200 ns of reset time. Reset option 2 is selected by connecting a timing resistor (R1 in
Figure 4) from the TRST input to ground.
Table 6. J7 Pin Descriptions
Jumper #
Description
J7
TRST – VDD or R1 to GND
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5. Schematic
D
G N
8
7
D
V D
1 1
1 2
E D M O
T S T R
2
1
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6. Bill of Materials
Table 7. Si825x Multi-Phase POL Reference Design Bill of Materials
Item
1
Quantity
Reference
Part Number
PCC2182CT-ND
PCC1812CT-ND
2551-2-00-44-00-00-07-0
2551-2-00-44-00-00-07-0
S2012-02-ND
Manufacturer
Digi-Key
Digi-Key
Bisco
Description
10 uF
1
1
1
1
1
1
1
1
1
1
1
C1
C2
J1
J2
J3
J4
J5
J6
J7
R1
U1
2
0.1 uF
5 V
3
4
Bisco
GND
5
Digi-Key
Digi-Key
Bisco
HDR-2X2
HDR-2X07
IIN
6
S2012-07-ND
7
2551-2-00-44-00-00-07-0
2551-2-00-44-00-00-07-0
S1012-02-ND
8
Bisco
IIOUT
9
Digi-Key
Digi-Key
Digi-Key
HEADER
DNP
10
11
P150CCT-ND
Si8512-IS
Si851x
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NOTES:
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CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Email: [email protected]
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, rep-
resentation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation conse-
quential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to
support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where per-
sonal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap-
plication, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
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Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
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