LTC4015_15 Datasheet, PDF (71/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
DETAILED Register Descriptions
drvcc_good (Sub-Address 0x39, Bit 9, R)
This bit indicates that the DRV_CC pin voltage is above the DRV_CC undervoltage lockout level (4.3V typical).
cell_count_error (Sub-Address 0x39, Bit 8, R)
This bit indicates that an invalid combination of CELLS pin settings have been detected.
ok_to_charge (Sub-Address 0x39, Bit 6, R)
This bit indicates that all system conditions are met to allow battery charging operation.
no_rt (Sub-Address 0x39, Bit 5, R)
This bit indicates that no frequency setting resistor is detected on the RT pin. The RT pin impedance detection circuit
will typically indicate a missing R_T resistor for values above 1.4MΩ.
thermal_shutdown (Sub-address 0x39, Bit 4, R)
This bit indicates that the LTC4015 is in thermal shutdown protection due to an excessively high die temperature
(typically 160°C and above).
vin_ovlo (Sub-address 0x39, Bit 3, R)
This bit indicates that the LTC4015 is in input voltage shutdown protection due to an input voltage above its protec-
tion shutdown threshold of approximately 38.6V (typical).
vin_gt_vbat (Sub-Address 0x39, Bit 2, R)
This bit indicates that the V_IN pin input voltage is sufficiently above the BATSENS battery voltage to allow charging
operation (typically +200mV).
intvcc_gt_4p3v (Sub-Address 0x39, Bit 1, R)
This bit indicates that the INTV_CC voltage is above the switching charger undervoltage lockout threshold value of
4.3V (typical).
intvcc_gt2p8v (Sub-Address 0x39, Bit 0, R)
This bit indicates that the INTV_CC pin voltage is above the measurement system undervoltage lockout threshold
value of 2.8V (typical).
VBAT (Sub-Address 0x3A, Bits 15:0, R)
This 16-bit two’s complement word indicates the A/D measurement result for the BATSENS pin.
V_BATSENS/cellcount = [VBAT] • 192.264µV for lithium chemistries.
V_BATSENS/cellcount = [VBAT] • 128.176µV for lead-acid.
VIN (Sub-Address 0x3B, Bits 15:0, R)
This 16-bit two’s complement word indicates the A/D measurement result for the V_IN pin voltage divided by 30. Input
voltage, V_VIN = [VIN] • 1.648mV
VSYS (Sub-Address 0x3C, Bits 15:0, R)
This 16-bit two’s complement word indicates the A/D measurement result for the SYS pin voltage divided by 30. System
voltage, V_SYS = [VSYS] • 1.648mV
IBAT (Sub-Address 0x3D, Bits 15:0, R)
This 16-bit word indicates the A/D measurement of 37.5 • (V_CSP – V_CSN) at the CSP, CSN pins. Negative values are
represented in two’s complement notation and indicate current flowing out of (discharging) the battery. Battery current
= [IBAT] • 1.46487µV/R_SNSB
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