Datasheet

I(TERM0)
O(TERM_STEP)
(SNS)
V
I =
R
I(CHRG0)
O(CHARGE_STEP)
(SNS)
V
I =
R
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SLUS942 –FEBRUARY 2010 www.ti.com
Table 6. Vender/Part/Revision Register (Read only)
Memory Location: 03, Reset State: 0100 x001 (continued)
BIT NAME READ/WRITE FUNCTION
B2 Revision2 Read Only
011: Revision 1.3;
B1 Revision1 Read Only
100-111: Future Revisions
B0 (LSB) Revision0 Read Only
Table 7. Battery Termination/Fast Charge Current Register (Read/Write)
Memory Location: 04, Reset State: 1000 1001 (89H)
BIT NAME READ/WRITE FUNCTION
Write: 1-Charger in reset mode, 0-No effect
B7 (MSB) Reset Read/Write
Read: always get "1"
B6 V
I(CHRG2)
Read/Write Charge current sense voltage: 27.2mV (default 0)
B5 V
I(CHRG1)
Read/Write Charge current sense voltage: 13.6mV(default 0)
B4 V
I(CHRG0)
Read/Write Charge current sense voltage: 6.8mV (default 0)
B3 NA Read/Write NA
B2 V
I(TERM2)
Read/Write Termination current sense voltage: 13.6mV (default 0)
B1 V
I(TERM1)
Read/Write Termination current sense voltage: 6.8mV (default 0)
B0 (LSB) V
I(TERM0)
Read/Write Termination current sense voltage: 3.4mV (default 1)
Default charge current is 55 0mA and default termination current is 100 mA, if a 68-mΩ sensing resistor is used.
Both the termination current range and charge current range are depending on the sensing resistor R
(SNS)
). The
termination current step (I
O(TERM_STEP)
) is calculated using Equation 2:
(2)
Table 8 shows the termination current settings with two sensing resistors.
Table 8. Termination Current Settings for 68-mΩ and 100-mΩ Sense Resistors
I
(TERM)
(mA) I
(TERM)
(mA)
BIT V
I(TERM)
(mV)
R
(SNS)
= 68mΩ R
(SNS)
= 100mΩ
V
I(TERM2)
13.6 200 136
V
I(TERM1)
6.8 100 68
V
I(TERM0)
3.4 50 34
Offset 3.4 50 34
The charge current step (I
O(CHARGE_STEP)
) is calculated using Equation 3:
(3)
Table 9 shows the charge current settings with two sensing resistors.
Table 9. Charge Current Settings for 68-mΩ and 100-mΩ Sense Resistors
I
O(CHARGE)
(mA) I
O(CHARGE)
(mA)
BIT V
I(REG)
(mV)
R
(SNS)
= 68mΩ R
(SNS)
= 100mΩ
V
I(CHRG2)
27.2 400 272
V
I(CHRG1)
13.6 200 136
V
I(CHRG0)
6.8 100 68
Offset 37.4 550 374
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