DC1697A Analog Devices

DEMO MANUAL DC1697A LTC2945 2 Wide Range I C Power Monitor DESCRIPTION Demonstration circuit 1697A features the LTC2945. The maximum values are stored and an overrange alert with LTC2945 is a rail-to-rail system monitor that measures programmable thresholds minimizes the need for software 2 current, voltage, and power. It features an operating range polling. Data is reported via a standard I C interface. The of 2.7V to 80V and includes a shunt regulator for supplies demo board is populated for a 5A application. This can above 80V to allow flexibility in the selection of input sup- be changed by populating R1 accordingly. ply. The current common mode measurement range of Design files for this circuit board are available at 0V to 80V is independent of the input supply. An onboard DEMO MANUAL DC1697A QUICK START PROCEDURE Jumper Settings ADIN: ADC input measured by the onboard ADC. Can measure between 0V and 2.048V. VDD SEL: Selects the V source. It can be set to VIN, DD INTVCC or EXTVDD (which requires a voltage to be present VPU: Pull up voltage for the ALERT LED. Connected on this at the EXTVDD turret.) Please see Hardware Setup sec- board to a 5V isolated supply on the DC590. If a DC590 tion for examples of how these different jumper settings is not used and the DC1697A is operated independently, are used. a 5V supply should be provided here. SDA: Connects or separates the SDAI to SDAO pins. For use Digital Connections with QuikEval , leave it on TIE. The pins can be separated 2 SCL: I C Clock turret in order to test applications using optoisolation. 2 2 SDA/SDAI: I C Bus Data input, can be tied to SDAO through ADR0, ADR1: Selects the I C slave address of the LTC2945. the SDA Jumper. Any changes here should also be made inside of QuikEval for communications to persist. 2 SDAO: I C Bus Data output. Should be connected to SDAI. ALERT: Fault Alert Output. Connected to ALERT LED. Open External Connections Drain logic output that is pulled to ground after an event Signal connections are made via the row of turret posts resulting in a fault occurs. along the edges of the board. LEDs GND: (4 turrets)These turrets are connected directly to the ground planes. ALERT: Will light up red on an ALERT condition. Can also be monitored on the ALERT turret. VIN: Used as a supply and current sense input for the internal current sense amplifier. Depending on the INTVCC: Will light up green when INTVCC is providing configuration of VDD SEL, can also be tied to EXTVDD. power. EXTVDD: High Voltage Supply Input. This pin powers an Operating Principles internal series regulator with input voltages ranging from 5V to 80V and produces 5V for INTVCC when above 7V. The DC1697A was designed to be connected to the DC590 and controlled through the QuikEval suite of software. All INTVCC: Internal Low Voltage Supply Input/Output. This thresholds can be set and ADC registers read back through turret is used to power internal circuitry and can be con- the QuikEval interface, which was designed to provide a figured as a direct input, as a linear regulator from a higher convenient way to evaluate the LTC2945. voltage connected to V or as a shunt regulator. Please DD see LTC2945 data sheet for more details. dc1697afa 2