Analog Devices LTC2943 | Demoboard DC1812A-A

Description

Demonstration circuit 1812A (Figure 1) features the LTC®2943. The LTC2943 has an operating range of 3.6V to 20V making it perfectly suited for multicell battery applications. A precision analog coulomb counter integrates current measured through a sense resistor between the battery’s positive terminal and the load or charger. The LTC2943 measures voltage, current and temperature with an internal 14-bit No Latency ΔΣ™ ADC. The measurementsare stored in internal registers accessible via the onboard SMBus/I2C interface.The LTC2943 has programmable high and low thresholds for all measured quantities. If a programmed threshold is exceeded, the device reports an alert using either the SMBus alert protocol or by setting a flag in the internal status registerThe LTC2943 requires only a single low value sense resistor to set the measured current range. The default value assembled on the DC1812A is 100mΩ for a maximum current measurement of 500mA. The LTC2943 has asoftware-configurable charge complete/alert pin. When the pin is set for charge complete, a jumper connects the pushbutton which simulates a logic low input at the AL/CC pin. This sets the ACR register to FFFFh whichindicates a full battery. When the pin is configured for alert, the same jumper is used to connect a red LED that indicates an alert is present.The DC1812A is a part of the QuikEval™ system for quick evaluation with a host controller through a PC using the DC590 or DC2026.

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