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Analog Devices LTC2944 | Demoboard DC1812A-B
Multicell Battery Gas Gauge with Temperature,Voltage and Current Measurement
Overview
| Topology | Other Topology |
| Input voltage | 3.6-20 V |
| IC revision | 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.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 625 nm, Red | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]625 nm | Emitting ColorRed | Peak Wavelength [typ.]630 nm | Luminous Intensity [typ.]150 mcd | Forward Voltage [typ.]2 V | Chip TechnologyAlInGaP | Viewing Angle Phi 0° [typ.]140 ° | – | – | MountSMT | Length3.2 mm | Height0.68 mm | – | – | Operating Temperature -40 °C up to +85 °C | ||||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins3 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |