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Datasheet MAX1647 - Chemistry-Independent Battery Chargers - Maxim Integrated Products

Chemistry-Independent Battery ChargersMAX1647/MAX1648

Figure 8 shows the mapping between V0 (the voltage-regulation-loop set point) and the ChargingVoltage( )data.

The power-on reset value for the ChargingVoltage( )register is 0xFFF0; thus, the first time a MAX1647 ispowered on, the BATT voltage regulates to 16.368Vwith VREF= 4.096V. Any time the BATTERY_PRESENTstatus bit is clear, the ChargingVoltage( ) registerreturns to its power-on reset state.

ChargingCurrent( )

The ChargingCurrent( ) command uses Write-Wordprotocol. The command code for ChargingCurrent( ) is0x14; thus, the CMD7–CMD0 bits in Write-Word proto-col should be 0b00010100. The 16-bit binary numberformed by D15–D0 represents the current-limit set point(I0) in milliamps. Tying SEL to AGND selects a 1.023Amaximum setting for I0. Leaving SEL open selects a2.047A maximum setting for I0. Tying SEL to VL selectsa 4.095A maximum setting for I0.

16.368

VREF = 4.096V

12.592

VOLTAGE SET POINT (V0)

8.400

4.192

0b000000000000xxxx

0x000x

0b000100000110xxxx

0x106x

0b001000001101xxxx

0x20Dx

0b001100010011xxxx

0x313x

0b001111111111xxxx

0x3FFx

0b111111111111xxxx

0xFFFx

ChargingVoltage( ) D15–D0 DATA

Figure 8. ChargingVoltage( ) Data to Voltage Mapping18

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