RAJ240080 Datasheet, PDF (42/73 Pages) Renesas Technology Corp – Integrated Li-ION Battery Management IC for 2-5 Series Cell

Figure 4-6 Current integrating circuit block diagram
ISENS1
ISENS0
φCC
Reference
voltage generator
Clock/interrupt
control circuit
∆Σ A/D converter
Current integration interrupt
Current integration data register H Current integration data register M Current integration data register L
Current integration control register
Figure 4-7 Operation timing of Current integrating circuit
φCC
CCRST bit
Current integration
internal operating clock
CCRH ,CCRM,
and CCRL register
Current integration
interrupt request
CCRST bit is set to 1
Conversion 1
Undefined (or previous conversion result)
Conversion 2
Result of conversion 1
Result of conversion 2
4.6.4 Current Integration Circuit in Impedance Measurement Mode
The current integrating circuit for impedance measurement measures current of the sense resister connected
between the pins ISENS1 and ISENS0 by converting the voltage of that into digital values. This circuit can measure
the impedance value because it can measure the current with the A/D converter synchronously. Analog signals are
input from the ISENS1 and ISENS0 pins.
Table 4-3 Current integrating Circuit for impedance Measurement Performance shows Current integrating Circuit
for impedance Measurement Performance,
Figure 4-8 Current integrating circuit for impedance measurement block diagram shows current integrating circuit
for impedance measurement block diagram, Figure 4-9 Operation timing of current integrating circuit for
impedance measurement shows operation timing of current integrating circuit for impedance measurement.
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