Summary of ANALOG DEVICES ANNOUNCES PRIMARY BATTERY SOH MONITOR WITH PRECISION COULOMB COUNTER
Analog Devices’ LTC3337 is a primary battery state-of-health (SOH) monitor with a built-in precision coulomb counter, designed for series placement with minimal voltage drop. It tallies all discharge with infinite dynamic range, stores SOC in an internal register accessible via I2C, and provides a programmable discharge alarm that triggers an IRQ. Additional monitors include battery voltage, impedance, and temperature; it offers selectable peak current limits, a supercapacitor balancer, and comes in a 12‑lead 2 mm × 2 mm LFCSP.
Parts used in the LTC3337 Project:
- LTC3337 IC (primary battery SOH monitor with precision coulomb counter)
- I2C interface connection (for register access)
- IRQ interrupt pin connection (for discharge alarm)
- Primary battery (1.8 V to 5.5 V range)
- Supercapacitor (for ±10 mA balancer integration) <li PCB footprint for 12-lead 2 mm × 2 mm LFCSP package
- Program/configuration inputs for peak input current limits
- Temperature sensing connection (internal/external as applicable)
Analog Devices announced a new IC. The LTC3337 is a primary battery state of health (SOH) monitor with a built-in precision coulomb counter. It is designed to be placed in series with a primary battery with minimal associated series voltage drop. The patented infinite dynamic range coulomb counter tallies ALL accumulated battery discharge and stores it in an internal register accessible via an I2C interface. A discharge alarm threshold based on this state of charge (SOC) is programmable. When it is reached, an interrupt is generated at the IRQ pin. Coulomb counter accuracy is constant down to no load.
Features
- Battery Input Voltage Range: 1.8 V to 5.5 V
- 100 nA Quiescent Current
- 8 Primary Battery Peak Input Current Limits: 5 mA/ 10 mA/ 15 mA/ 20 mA/ 25 mA/ 50 mA/ 75 mA/ 100 mA
- SOH Monitor for Primary Battery
- Integrated Coulomb Counter (Q)
- Additional Monitors for Battery Voltage (V), Battery Impedance (Z), and Temperature (T)
- Primary Battery Current (BAT_IN) or Load Current (BAT_OUT) is Counted
- Integrated ±10 mA Supercapacitor Balancer
- Programmable Coulomb Counter Prescaler for Wide Range of Battery Sizes
- Programmable Discharge Alarm Threshold with Interrupt Output
- I2C Interface
- Tiny 12-Lead 2 mm × 2 mm LFCSP
The LTC3337 also integrates additional SOH monitoring which measures and reports via I2C: battery voltage, battery impedance, and temperature.
Read more: ANALOG DEVICES ANNOUNCES PRIMARY BATTERY SOH MONITOR WITH PRECISION COULOMB COUNTER
- What is the LTC3337 used for?
It monitors primary battery state of health and includes a precision coulomb counter to tally accumulated discharge. - How is the coulomb counter data accessed?
The accumulated discharge is stored in an internal register accessible via the I2C interface. - Does the LTC3337 provide a discharge alarm?
Yes, it has a programmable discharge alarm threshold that generates an interrupt at the IRQ pin when reached. - What battery voltage range does the LTC3337 support?
It supports battery input voltages from 1.8 V to 5.5 V. - Can the LTC3337 measure parameters other than charge?
Yes, it also measures and reports battery voltage, battery impedance, and temperature via I2C. - What are the available peak input current limits?
There are eight selectable peak input current limits: 5 mA, 10 mA, 15 mA, 20 mA, 25 mA, 50 mA, 75 mA, and 100 mA. - Is the coulomb counter accurate at very low loads?
Yes, the coulomb counter accuracy is constant down to no load. - Does the LTC3337 include any supercapacitor features?
Yes, it integrates a ±10 mA supercapacitor balancer. - What package does the LTC3337 come in?
It comes in a tiny 12-lead 2 mm × 2 mm LFCSP package.
