TS1108 Data Sheet

TS1108 Coulomb Counter: Bidirectional Current Sense Amplifier

with Integrator + Comparator

The TS1108 coulomb counter accurately measures battery depletion while also indicat-

ing the battery charging polarity. The battery discharge current is monitored by a current-

sense amplifier through an external sense resistor. Utilizing an Integrator and a Compa-

rator plus a Monoshot, the TS1108 voltage-to-frequency converter provides a series of

90 µs output pulses at COUT which represents an accumulation of coulombs flowing out

of the battery. The charge count frequency is adjustable by the integration resistor and

capacitor.

Applications

• Power Management Systems

• Portable/Battery-Powered Systems

• Smart Chargers

KEY FEATURES

• Coulomb Counting plus Charge Polarity

• Adjustable Charge Count Frequency

• External Crystal Oscillator Not Required

• Low Supply Current

• Current Sense Amplifier: 0.68 µA

• High Side Bidirectional Current Sense

Amplifier

• Wide CSA Input Common Mode Range: +2

V to +27 V

• Low CSA Input Offset Voltage: 150

µV(max)

• Low Gain Error: 1%(max)

• Two Gain Options Available:

• Gain = 20 V/V : TS1108-20

• Gain = 200 V/V : TS1108-200

• 16-Pin TQFN Packaging (3 mm x 3 mm)

silabs.com | Smart. Connected. Energy-friendly.

Rev. 1.0