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DESCRIPTION
Demonstration circuit 1697A features the LTC2945. The
LTC2945 is a rail-to-rail system monitor that measures
current, voltage, and power. It features an operating range
of 2.7V to 80V and includes a shunt regulator for supplies
above 80V to allow flexibility in the selection of input sup-
ply. The current common mode measurement range of
0V to 80V is independent of the input supply. An onboard
0.75% accurate 12-bit ADC measures load current, input
voltage and an auxiliary external voltage. A 24-bit power
value is generated by digitally multiplying the measured
12-bit load current and input voltage data. Minimum and
BOARD PHOTO
Arrow.com.
Downloaded from
TO DC590
4V TO 80V
Figure 1. Proper Test Equipment Setup
DEMO MANUAL DC1697A
Wide Range I
maximum values are stored and an overrange alert with
programmable thresholds minimizes the need for software
polling. Data is reported via a standard I
demo board is populated for a 5A application. This can
be changed by populating R1 accordingly.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1697A
L, LT, LTC, LTM, QuikEval, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
LTC2945
2
C Power Monitor
2
C interface. The
LOAD
dc1697A F01
dc1697afa
1
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Table of Contents
Related Manuals for Linear Technology LTC2945
Summary of Contents for Linear Technology LTC2945
- Page 1 0.75% accurate 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power L, LT, LTC, LTM, QuikEval, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Page 2: Quick Start Procedure
LTC2945. voltage connected to V or as a shunt regulator. Please see LTC2945 data sheet for more details. dc1697afa Arrow.com. Arrow.com. Downloaded from... -
Page 3: Hardware Setup
DEMO MANUAL DC1697A HARDWARE SETUP Due to having separate V and SENSE pins, the LTC2945 correctly. However, should VDD_SEL be tied to EXTVDD offers great flexibility in terms of supply options. The fol- then a separate voltage source should be provided at the lowing are some examples of how to connect and set up the EXTVDD turret. - Page 4 DEMO MANUAL DC1697A HARDWARE SETUP INTVCC can also be used as a 6.3V shunt regulator. For The 5k shunt resistor shown provides 15mA to INTVCC at supplies greater than 80V, simply connect power through 80V. The allowable range of resistance for a given input a shunt resister for high or low shunt configuration as range is given by the following formula: shown in Figure 3 and 4 respectively.
- Page 5 DEMO MANUAL DC1697A HARDWARE SETUP Jumper VDD_SEL Set to INTVCC with a Resistor Connected to INTVCC 0V TO 80V LOAD dc1697A F04 > 80V Figure 4. Powering DC1697A Through Low-Side Shunt Regulator in High-Side Current Sense Topology dc1697afa Arrow.com. Arrow.com. Arrow.com.
- Page 6 DEMO MANUAL DC1697A HARDWARE SETUP –48V systems can also be monitored by simply setting provides isolation and level shifting, as the I C interface VDD_SEL to EXTVDD with the –48V input tied to VIN and is operating at –48V with respect to –48V RTN, which is GND and the –48V return tied to EXTVDD.
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Page 7: Software Setup
The DC1697A control panel was designed to allow the user red on the software GUI. The ALERT LED should also be to quickly evaluate the LTC2945. The user has the ability red on the DC1697A itself. Click the Clear Alerts button to set fault thresholds, enable/disable and clear alerts as to clear all alerts. -
Page 8: Parts List
PANASONIC, ERJ3GEYJ332V TP1 (OPT) CONN., HDR., MALE,1X2, 2mm, THT, STRT SULLINS, NRPN021PAEN-RC IC, Wide Range I C Power Monitor, QFN-12(UD) LINEAR TECHNOLOGY CORP. LTC2945CUD I.C., Serial EEPROM TSSOP-8 MICROCHIP 24L C025-I/ST SHUNTS AS SHOWN ON Shunt, 2mm CTRS. SAMTEC 2SN-BK-G... -
Page 9: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 10 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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