LTC4015_15 Datasheet, PDF (65/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
DETAILED Register Descriptions
(bits 4:0). VCHARGE_JEITA_4_3_2 contains three bit packed values, vcharge_jeita_4 (bits 14:10), vcharge_jeita_3
(bits 9:5), and vcharge_jeita_2 (bits 4:0). These registers are ignored for lead-acid batteries or if en_jeita=0.
vcharge_jeita_n (n = 2,3,4,5,6)
These five 5-bit values set the VCHARGE_SETTING values to be used in each of the JEITA voltage vs temperature
regions. There are no defined charge voltages for regions 1 and 7 because battery charging is paused in these
regions. See the JEITA Temperature Qualified Charging section.
Programming of JEITA Values
REGION 1
REGION 2
REGION 3
REGION 4
REGION 5
REGION 6
REGION 7
[JEITA_T1]
[JEITA_T2]
[JEITA_T3 ]
[JEITA_T4]
[JEITA_T5]
[JEITA_T6]
CHARGER
OFF
icharge_jeita_2
vcharge_jeita_2
icharge_jeita_3
vcharge_jeita_3
icharge_jeita_4
vcharge_jeita_4
icharge_jeita_5
vcharge_jeita_5
icharge_jeita_6 CHARGER
vcharge_jeita_6 ^OFF
ICHARGE_JEITA_6_5 (Sub-Address 0x27, Bits 9:0, Fixed: R, Programmable: R/W),
ICHARGE_JEITA_4_3_2 (Sub-Address 0x28, Bits 14:0, Fixed: R, Programmable: R/W)
For lithium chemistries, these two registers contain the charge current settings to be used in the JEITA current vs
temperature profile. ICHARGE_JEITA_6_5 contains two bit packed values, icharge_jeita_6 (bits 9:5) and icharge_jeita_5
(bits 4:0). ICHARGE_JEITA_4_3_2 contains three bit packed values, icharge_jeita_4 (bits 14:10), icharge_jeita_3 (bits
9:5), and icharge_jeita_2 (bits 4:0). These registers are ignored for lead-acid batteries or if en_jeita=0.
icharge_jeita_n (n = 2,3,4,5,6)
These five 5-bit values set the ICHARGE_TARGET values to be used in each of the JEITA current vs temperature
regions. There are no defined charge currents for regions 1 and 7 because battery charging is paused in these
regions. See the JEITA Temperature Qualified Charging section.
Programming of JEITA Values
REGION 1
REGION 2
REGION 3
REGION 4
REGION 5
REGION 6
REGION 7
[JEITA_T1]
[JEITA_T2]
[JEITA_T3 ]
[JEITA_T4]
[JEITA_T5]
[JEITA_T6]
CHARGER
OFF
icharge_jeita_2
vcharge_jeita_2
icharge_jeita_3
vcharge_jeita_3
icharge_jeita_4
vcharge_jeita_4
icharge_jeita_5
vcharge_jeita_5
icharge_jeita_6 CHARGER
vcharge_jeita_6 ^OFF
CHARGER_CONFIG_BITS (Sub-Address 0x29, Bits 2:0, Fixed: R, Programmable: R/W)
This register consists of individual battery charger configuration bits which enable specific battery charger functions.
en_c_over_x_term (Sub-Address 0x29, Bit 2, Fixed: R, Programmable: R/W)
For lithium chemistries, setting this bit enables C/x charge termination, in conjunction with C_OVER_X_THRESHOLD.
For lead-acid batteries, en_c_over_x_term is ignored. Default is 0.
en_lead_acid_temp_comp (Sub-Address 0x29, Bit 1, Fixed: R, Programmable: R/W)
For lead-acid batteries, setting this bit enables temperature compensated charge voltage levels as detailed in the
Lead-Acid Temperature Compensated Charging section. Default is 1 for lead-acid batteries. For lithium chemistries,
en_lead_acid_temp_comp is ignored.
en_jeita (Sub-Address 0x29, Bit 0, Fixed: R, Programmable: R/W)
For lithium chemistries, setting this bit enables the JEITA temperature qualified algorithm as detailed in the JEITA
Temperature Qualified Charging section. The charging parameters are set by JEITA_Tn, vcharge_jeita_n, and
icharge_jeita _n. Default is 1 for lithium chemistries. For lead-acid batteries, en_jeita is ignored.
4015f
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