Datasheet LTC4015 (Analog Devices) - 22
| Manufacturer | Analog Devices |
| Description | Multichemistry Buck Battery Charger Controller with Digital Telemetry System |
| Pages / Page | 76 / 22 — OPERATION ICL, UVCL, ICHARGE and VCHARGE DACS. Charging Timers. TIMED. … |
| File Format / Size | PDF / 1.6 Mb |
| Document Language | English |
OPERATION ICL, UVCL, ICHARGE and VCHARGE DACS. Charging Timers. TIMED. CURRENT. TIMEOUT. APPLICABLE. PARAMETER. VALUE. CHEMISTRIES
Model Line for this Datasheet
Text Version of Document
LTC4015
OPERATION ICL, UVCL, ICHARGE and VCHARGE DACS Charging Timers
The LTC4015 has four DAC’s for setting target values of: There are a total of four timers in the LTC4015 used in the 1. Maximum battery charge voltage (VCHARGE_ charging algorithms. Timers are 16-bit, and measure time SETTING) in seconds. 216 = 65535 seconds or 18.2 hours maximum. Each timer has current value (read only) and a timeout 2. Maximum battery charge current (ICHARGE_ value (read/write): TARGET)
TIMED CURRENT TIMEOUT APPLICABLE
3. Minimum input voltage, UVCL (VIN_UVCL_SETTING)
PARAMETER VALUE VALUE CHEMISTRIES
4. Maximum input current (IIN_LIMIT_SETTING) Constant-Voltage CV_TIMER (0x31) MAX_CV_TIME Lithium State Time (0x1D) Chemistries The user can program the target values only with the I2C Maximum Total MAX_CHARGE_ MAX_CHARGE_ Lithium port. The LTC4015 uses the target values as a starting point, Charge Time TIMER (0x30) TIME (0x1E) Chemistries the charging algorithms calculate the actual values to be Maximum ABSORB_TIMER MAX_ABSORB_ LiFeP04, Absorb Charge (0x32) TIME (0x2B) Lead-Acid applied to the DACs to support functions such as Li-Ion Time precharge, absorb and equalize charge voltage adders, Maximum EQUALIZE_ EQUALIZE_TIME Lead-Acid MPPT, lead-acid charge voltage temperature compensa- Equalize Charge TIMER (0x33) (0x2D) Time tion, and charger soft starting. The target value register is read/write, the actual value
Low Power Ship Mode
register is read only. In the case of the UVCL register, The LTC4015 can reduce its already low standby current minimum input voltage is scaled by external resistors. to approximately 5μA in a special mode designed for For further information see the Register Description and shipment and storage. Ship mode is armed by setting the Battery Charging sections. ARM_SHIP_MODE register to 0x534D (ASCII for SM) via JEITA temperature controlled charging does not use the serial port. Note that once armed, ship mode cannot VCHARGE_SETTING or ICHARGE_TARGET for setting be disarmed (the ARM_SHIP_MODE register cannot be target values, see JEITA Temperature Controlled Charging cleared once set to 0x534D). Once armed, ship mode takes section for further information.
The Target and Actual Registers as Well as the DAC Size are Shown Below: FUNCTION TARGET VALUE REGISTER ACTUAL VALUE REGISTER HEX ADDRESS HEX ADDRESS NAME (SIZE) DEFAULT NAME (SIZE) DEFAULT
Input Current Limit IIN_LIMIT_SETTING 0x15(5:0) 0x3F IIN_LIMIT_DAC 0x46(5:0) 0x3F Battery Charge Voltage VCHARGE_SETTING 0x1B(5:0)1 0x3F VCHARGE_DAC 0x45(5:0) 0x3F Minimum Input Voltage VIN_UVCL_SETTING 0x16(8:0) 0xFF Scaled by External (UVCL) Resistors Battery Charge Current ICHARGE_TARGET 0x1A(4:0) 0x1F ICHARGE_DAC 0x44(4:0) 0x1F 1 Lithium chemistries = 5b (4:0), lead-acid chemistry = 6b (5:0) 4015fb 22 For more information www.linear.com/LTC4015 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Data Sheet Conventions Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram I2C Timing Diagram Operation Applications Information Register Description DETAILED Register Descriptions Typical Applications Package Description Revision History Typical Application Related Parts
OPERATION ICL, UVCL, ICHARGE and VCHARGE DACS Charging Timers
The LTC4015 has four DAC’s for setting target values of: There are a total of four timers in the LTC4015 used in the 1. Maximum battery charge voltage (VCHARGE_ charging algorithms. Timers are 16-bit, and measure time SETTING) in seconds. 216 = 65535 seconds or 18.2 hours maximum. Each timer has current value (read only) and a timeout 2. Maximum battery charge current (ICHARGE_ value (read/write): TARGET)
TIMED CURRENT TIMEOUT APPLICABLE
3. Minimum input voltage, UVCL (VIN_UVCL_SETTING)
PARAMETER VALUE VALUE CHEMISTRIES
4. Maximum input current (IIN_LIMIT_SETTING) Constant-Voltage CV_TIMER (0x31) MAX_CV_TIME Lithium State Time (0x1D) Chemistries The user can program the target values only with the I2C Maximum Total MAX_CHARGE_ MAX_CHARGE_ Lithium port. The LTC4015 uses the target values as a starting point, Charge Time TIMER (0x30) TIME (0x1E) Chemistries the charging algorithms calculate the actual values to be Maximum ABSORB_TIMER MAX_ABSORB_ LiFeP04, Absorb Charge (0x32) TIME (0x2B) Lead-Acid applied to the DACs to support functions such as Li-Ion Time precharge, absorb and equalize charge voltage adders, Maximum EQUALIZE_ EQUALIZE_TIME Lead-Acid MPPT, lead-acid charge voltage temperature compensa- Equalize Charge TIMER (0x33) (0x2D) Time tion, and charger soft starting. The target value register is read/write, the actual value
Low Power Ship Mode
register is read only. In the case of the UVCL register, The LTC4015 can reduce its already low standby current minimum input voltage is scaled by external resistors. to approximately 5μA in a special mode designed for For further information see the Register Description and shipment and storage. Ship mode is armed by setting the Battery Charging sections. ARM_SHIP_MODE register to 0x534D (ASCII for SM) via JEITA temperature controlled charging does not use the serial port. Note that once armed, ship mode cannot VCHARGE_SETTING or ICHARGE_TARGET for setting be disarmed (the ARM_SHIP_MODE register cannot be target values, see JEITA Temperature Controlled Charging cleared once set to 0x534D). Once armed, ship mode takes section for further information.
The Target and Actual Registers as Well as the DAC Size are Shown Below: FUNCTION TARGET VALUE REGISTER ACTUAL VALUE REGISTER HEX ADDRESS HEX ADDRESS NAME (SIZE) DEFAULT NAME (SIZE) DEFAULT
Input Current Limit IIN_LIMIT_SETTING 0x15(5:0) 0x3F IIN_LIMIT_DAC 0x46(5:0) 0x3F Battery Charge Voltage VCHARGE_SETTING 0x1B(5:0)1 0x3F VCHARGE_DAC 0x45(5:0) 0x3F Minimum Input Voltage VIN_UVCL_SETTING 0x16(8:0) 0xFF Scaled by External (UVCL) Resistors Battery Charge Current ICHARGE_TARGET 0x1A(4:0) 0x1F ICHARGE_DAC 0x44(4:0) 0x1F 1 Lithium chemistries = 5b (4:0), lead-acid chemistry = 6b (5:0) 4015fb 22 For more information www.linear.com/LTC4015 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Data Sheet Conventions Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram I2C Timing Diagram Operation Applications Information Register Description DETAILED Register Descriptions Typical Applications Package Description Revision History Typical Application Related Parts