LP3910 Datasheet, PDF (55/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

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8.6.6 I_LIMIT Register (03)H Current Limit Register
Access
Data
Reserved
D7–2
Read only 0
Reset
n/a
8.6.7 ADCC Register (0a)H ADC Control Register
LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
D1–0
USB Current Limit
00: controlled by USB_ISEL pin
[low = 100 mA, high = 500 mA]
01: 100 mA
10: 500 mA
11: 800 mA
2’b00
Access
Data
D7
R/W
V_RANGE
D6
R/W
I_RANGE
D5
D4
Read Only
ADC Overflow Data Ready
0: 2.6 V – 3.5
V
1: 2.6 V – 4.4
V
0: 0 mA – 605 mA 0: no overflow 0: no data
1: 0 mA – 1100 mA 1: overflow
1: data ready
D3
R/W
Start
Conversion
0: default
1: start
conversion
Reset 0
0
0
0
0
D2
ADC Enable
0: Disabled
D1–0
R/W
ADC source
selection
00: battery voltage
1: Enabled
0
01: battery charge
current
10: ADC1
11: ADC2
0
8.6.8 ADCD Register (0b)H ADC Output Data Register
Charge current 0 A to 1.1 A mirrored to 0 µA to 250 µA, ADC measures voltage drop across R_SENSE 4.64 kΩ.
Access
Data
Reset
Battery voltage:
Battery charge current
ADC1:
ADC2:
8’h00
8’h00 = V_REFH = 1.225V
8’h00 = V_REFH = 1.225V
D7–0
Read Only 0
8’h00 = 2.6V
8’h00= 2.6V
8’h00 = 0
8’h00 = 0
8’hFF = 2*V_REFH = 2.45 V
8’hFF = 2*V_REFH = 2.45 V
8’hFF = 3.5V 1 LSB = 0.9 / 256
= (3.5 mV) range 0
8’hFF = 4.4 V 1 LSB = 1.8 /
256 = (7.0 mV) range 1
8’hFF = 0.6463 V = 605 mA
range 0
8’hFF = 1.175V = 1100 mA
range 1
(1 LSB = V_REFH/256)
(1 LSB = V_REFH/256)
8.6.9 IMR Register (0c)H Interrupt Mask Register
Access
Data
Reset
D7–0
r/w
1: Enable INTn (n=0…7) to pull IRQB low
0: Mask Interrupt source INTn
8’h00
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