RAJ240080 Datasheet, PDF (43/73 Pages) Renesas Technology Corp – Integrated Li-ION Battery Management IC for 2-5 Series Cell

Table 4-3 Current integrating Circuit for impedance Measurement Performance
Item
Conversion method
Analog input voltage
Operating clock φCC
Resolution
Analog input pin
Conversion time per cycle (note 1) ^Note
ΔΣ conversion
-0.1 V to 0.1 V
Performance
fOCO divided by 32: 131.072 kHz
(fOCO=AFE on-chip oscillator)
Conversion time 1 ms(note 1): 7 bits
Conversion time 2 ms(note 1): 8 bits
Conversion time 4 ms(note 1): 9 bits
Conversion time 8 ms(note 1): 10 bits
Potential difference between ISENS1 and ISENS0 pins
1 ms, 2 ms, 4 ms, 8 ms
Note The conversion time varies with the settting of the ADTIME1 bit and the ADTIME0 bit in the ADCON1
register.
Figure 4-8 Current integrating circuit for impedance measurement block diagram
φCC
(fOCO divided by 32)
Clock/interrupt
control circuit
Current integration
for impedance
measurement
interrupt
ISENS1
ISENS0
Δ∑ converter
Current Integrating Circuit for Current Integrating Circuit for
Impedance Measurement
Impedance Measurement
Data Register H
Data Register L
AD control register
AD control register 2
Figure 4-9 Operation timing of current integrating circuit for impedance measurement
φCC
(fOCO divided by 32)
INPST bit
Current integration for
impedance measurement
internal operating clock
INPRH and INPRL registers
Current integration for
impedance measurement
interrupt request
INPST bit is set to 1
Conversion 1
Undefined (or previous conversion result)
Conversion 2
Result of conversion 1
Result of conversion 2
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