Datasheet
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Output Voltage Monitoring
LINEAR REGULATORS — I
2
C REGISTERS
TPS65810
TPS65811
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
Internal power good comparators monitor the LDO outputs and detect when the output voltage is below 90% of
the programmed value. This information is used by the TPS65810 to generate interrupts or to trigger distinct
operating modes, depending on specific I
2
C register settings. See interrupt and sequencing controller section for
additional details.
The I
2
C registers that control LDO-related functions are shown below. The HEX address for each register is
shown by the register name, together with the R or W functionality for the register bits. Shaded values indicate
default initial power-up values.
B7 B6 B5 B4 B3 B2 B1 B0
EN_LDO: ADDRESS = B, ALL BITS R/W
Bit name LDO1_EN LDO2_EN LDO3_EN LDO4_EN LDO5_EN SIM_SET SIM EN1 RTC_EN
Function LDO1 … 5 ON/OFF CONTROL SIM LDO output SIM/RTC ON/OFF CONTROL
voltage
When 0 OFF OFF OFF OFF OFF 2.5 V, ON OFF OFF
When 1 ON ON ON ON ON 1.8 V ON ON
LDO12: ADDRESS = C, ALL BITS R/W
Bit name LDO1_DISCH LDO1_2 SET LDO1_1 SET LDO1_0 SET LDO2_DISCH LDO2_2 SET LDO2_1 SET LDO2_0 SET
Function LDO1 output LDO1 OUTPUT VOLTAGE SETTING LDO2 output LDO2 OUTPUT VOLTAGE SETTING
discharge switch discharge
enable switch enable
When 0 OFF 000 = 1.25 V 001 = 1.5 V Default = OFF 000 = 1.25 V 001 = 1.5 V Default = 3.3 V
010 = 1.8 V 011 = 2.5 V 1.25 V 010 = 1.8 V 011 = 2.5 V
When 1 ON ON
100 = 2.85 V 110 = 3 V 100 = 2.85 V 110 = 3 V
110 = 3.2 V 111 = 3.3 V 110 = 3.2 V 111 = 3.3 V
LDO3, ADDRESS = D, ALL BITS R/W
Bit name LDO3_DISCH LDO3_6 SET LDO3_5 SET LDO3_4 SET LDO3_3 SET LDO3_2 SET LDO3_1 SET LDO3_0 SET
Function LDO3 output LDO3 OUTPUT VOLTAGE SETTING
discharge switch
enable
When 0 OFF SeeTable 8 for LDO3-5 output voltage setting, Power-up default = 1.505 V
When 1 ON
LDO4, ADDRESS = E, ALL BITS R/W
Bit name LDO4_DISCH LDO4_6 SET LDO4_5 SET LDO4_4 SET LDO4_3 SET LDO4_2 SET LDO4_1 SET LDO4_0 SET
Function LDO4 output LDO4 OUTPUT VOLTAGE SETTING
discharge switch
enable
When 0 OFF See Table 8 for LDO3-5 output voltage setting, Power-up default = 1.811 V
When 1 ON
LDO5, ADDRESS = F, ALL BITS R/W
Bit name LDO5_DISCH LDO5_6 SET LDO5_5 SET LDO5_4 SET LDO5_3 SET LDO5_2 SET LDO5_1 SET LDO5_0 SET
Function LDO5 output LDO5 OUTPUT VOLTAGE SETTING
discharge switch
enable
When 0 OFF See Table 8 for LDO3-5 output voltage setting, Power-up default = 3.111 V
When 1 ON
GPIO3, ADDRESS = 1C, ALL BITS R/W. NOTE: ONLY BIT B5 CONTROLS LDO-RELATED FUNCTIONALITY
Bit name GPIO3i/O GPIO3 LEVEL LDO0 ENABLE CHARGE NOT USED GPIO2 _INTSRC GPIO1 _INTSRC GPIO2 _SM2
_VLTG
Function SEE Table 15 SEE Table 15 LDO0 ON/OFF SEE Table 15 NOT USED SEE Table 15 SEE Table 15 SEE Table 15
CONTROL
When 0 LDO0 OFF
When 1 LDO0 ON
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