Texas Instruments TPS65820 Evaluation Module TPS65820EVM TPS65820EVM データシート
製品コード
TPS65820EVM
ADC – I
2
C REGISTERS
SLVS663B – MAY 2006 – REVISED APRIL 2008
..............................................................................................................................................................
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The I
2
C registers that control ADC-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. Default, initial power-up
values are shown in bold. In the timing equations, replace Bn with 1 for HI state, and 0 for LO state.
values are shown in bold. In the timing equations, replace Bn with 1 for HI state, and 0 for LO state.
B7
B6
B5
B4
B3
B2
B1
B0
ADC_SET, ADDRESS=1E, ALL BITS R/W
Bit Name
ADC_ENABLE
ADC_REF_EN
CHSEL2_SET
CHSEL1_SET
CHSEL0_SET
READ_MODE2
READ_MODE1
READ_MODE0
Function
ADC ON/OFF
ADC
ADC CHANNEL SELECTION
ADC SAMPLING SETTINGS
CONTROL
REFERENCE
SELECTION
When 0
OFF
Internal
000 = ANLG1
011 = V(TS)
110 = V(OUT)
000 = 1
011 = 16
110 = 128
001 = ANLG2
100 = Tj
111 = V(BAT)
001= 4
100 = 32
111 = 256
When 1
ON
External
010 = V(ISET1)
101 =
Default =
010 = 8
101 = 64
Default = 1
V(RTC_OUT)
ANLG1
ADC READING_HI, ADDRESS=1F, BITS B3/B4 R/W, ALL OTHER BITS READ ONLY
Bit Name
ADC_STATUS
NOT USED
NOT USED
ADC_READ1
ADC_READ0
D10
D9_MSB
D8
Function
CURRENT
NOT USED
NOT USED
ALU OUTPUT DATA
ADC
ADC CONVERSION OUTPUT
CONVERSION
SELECTION
AVERAGE
BITS
STATUS
CARRYOVER
BIT
When 0
DONE
NOT USED
NOT USED
00=LAST
10 = MAXIMUM
VALID ONLY AFTER ADC
01=AVERAGE
11 = MINIMUM
CONVERSION ENDS SEE
When 1
BUSY
NOT USED
NOT USED
Default= LAST
ADC_READING_LO
ADC READING_LO, ADDRESS=20, READ ONLY
Bit Name
D7
D6
D5
D4
D3
D2
D1
D0_LSB
Function
ADC CONVERSION OUTPUT BITS, VALID ONLY AFTER ADC CONVERSION ENDS
Value
VALUE=[B10*512 + B9*256 + B8*128 + B7*64 + B6*32 + B5*16 + B4*8 + B3*4 + B2*2 + B1] * [ VRNG(CHn) / 1023] ; Unit=Volts,
The LSB bit value is proportional to the ADC reference voltage - See V
RNG(CHn)
in electrical parameters
DHILIM1, ADDRESS=21, ALL BITS R/W
Bit Name
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
DHILIM10
DHILIM9
DHILIM8
Function
RESERVED
ADC MAX INPUT LIMIT RANGE SETTING (3
MSBs)
DHILIM2, ADDRESS=22, ALL BITS R/W
Bit Name
DHILIM7
DHILIM6
DHILIM5
DHILIM4
DHILIM3
DHILIM2
DHILIM1
DHILIM0_LSB
Function
ADC MAX INPUT LIMIT RANGE SETTING (8 LSBs)
DLOLIM1, ADDRESS=23, ALL BITS R/W
Bit Name
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
DLOLIM10
DLOLIM9
DLOLIM8
Function
RESERVED
ADC MIN INPUT LIMIT RANGE SETTING (3 MSBs)
DLOLIM2, ADDRESS=24, ALL BITS R/W
Bit Name
DLOLIM7
DLOLIM6
DLOLIM5
DLOLIM4
DLOLIM3
DLOLIM2
DLOLIM1
DLOLIM0_LSB
Function
ADC MIN INPUT LIMIT RANGE SETTING (8 LSBs)
ADC_DELAY, ADDRESS=25, ALL BITS R/W
Bit Name
ADC_TRG_GPIO3
EDGE _GPIO3
HOLDOFF
REPEAT
Delay_3
Delay_2
Delay_1
Delay_0
Function
USE GPIO3 AS
GPIO3
ADC
REPEAT
ADC EXTERNAL TRIGGER DELAY SETTING
ADC TRIGGER
TRIGGER
HOLDOFF
MODE
MODE
ON/OFF
ON/OFF
CONTROL
When 0
OFF
Falling Edge
OFF
OFF
t
DLY(TRIG)
= B4*400 + B3 * 200 + B2*100 + B1* 50, Units =
µ
s Default =
0
µ
s
When 1
ON
Rising Edge
ON
ON
ADC_WAIT, ADDRESS=26, ALL BITS R/W
Bit Name
ADC_cH2I_D1
ADC_cH2I_D0
BATIDI_D1
BATIDI_D0
WAIT_D3
WAIT_D2
WAIT_D1
WAIT_LSB
Function
ANLG2 PULLUP CURRENT
ANLG1 PULLUP CURRENT
ADC SAMPLE WAIT TIME, MULTIPLE SAMPLES MODE
SOURCE VALUE
SOURCE VALUE
When 0
11:60
µ
A, 10:50
µ
A, 01:10
µ
A,00: 0
11:60
µ
A, 10:50
µ
A, 01:10
µ
A,
0000 = 0
0100 = 0.08
1000 = 0.64
1100 = 5.12
Default= 00
00: WEAK PULLUP
0001 = 0.02
0101 = 0.16
1001 = 1.28
1101 = 10.24
When 1
Default : 00
0010 = 0.04
0110 = 0.24
1010 = 1.92
1110 = 15.36
0011 = 0.06
0111 = 0.32
1011 = 2.56
1111 = 20.48
Units = ms
Default = 0
74
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