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TS1108 Coulomb Counter User's Guide
The TS1108 coulomb counter accurately measures battery depletion while also indicat-
ing the battery charging polarity. The battery discharge current is monitored by a cur-
rent-sense amplifier through an external sense resistor. Utilizing an Integrator and a
Comparator 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.
The TS1108 CSA requires a very low 1.2 µA supply current, while also combining a 150
µV VOS(MAX) with a 0.6% gain error (MAX) for high precision current measurements.
The TS1108 provides a buffered CSA output which can be connected with a RC Filter to
reduce noise. The VDD supply requires a typical supply current of 1.93 µA when VREF
is disabled.
The TS1108 is fully specified to operate over the –40 °C to +85 °C temperature range
and is available in a low-profile thermally-enhanced 16-pin 3 x 3 mm TQFN package
with an exposed back-side paddle.
KEY FEATURES
• R
SENSE
: 50 mΩ ± 0.5%
• Compatible for Both Gain Options
• 20 V/V
• 200 V/V
ORDERING INFORMATION
• TS1108-20DB
• TS1108-200DB
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