Texas Instruments TPS65820 Evaluation Module TPS65820EVM TPS65820EVM 데이터 시트
제품 코드
TPS65820EVM
Output Voltage Monitoring
LINEAR REGULATORS — I
2
C REGISTERS
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SLVS663B – MAY 2006 – REVISED APRIL 2008
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 TPS65820 to generate interrupts or to trigger distinct
operating modes, depending on specific I
the programmed value. This information is used by the TPS65820 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.
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
3 V
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 = 2.85 V
OFF
000 = 1.25 V
001 = 1.5 V
Default = 3.3 V
010 = 1.8 V
011=2.5 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
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
See
for LDO3-5 output voltage setting,
Power-up default = 1.25 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
for LDO3-5 output voltage setting,
Power-up default = 2.75 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
for LDO3-5 output voltage setting,
Power-up default = 2.81 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
RTC_SET
GPIO2_INTSRC
GPIO1_INTSRC
GPIO2_SM2
_VLTG
Function
SEE
SEE
LDO0 ON/OFF
SEE
RTC_LDO
SEE
SEE
SEE
CONTROL
OUTPUT
VOLTAGE
When 0
LDO0 OFF
3.1 V
When 1
LDO0 ON
2.6 V
Copyright © 2006–2008, Texas Instruments Incorporated
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