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ADS1113IDGSR Datasheet(PDF) 18 Page - Texas Instruments

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Part No. ADS1113IDGSR
Description  Ultra-Small, Low-Power, 16-Bit Analog-to-Digital Converter with Internal Reference
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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ADS1113IDGSR Datasheet(HTML) 18 Page - Texas Instruments

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ADS1113
ADS1114
ADS1115
SBAS444A – MAY 2009 – REVISED AUGUST 2009 ......................................................................................................................................................... www.ti.com
When reading from the ADS1113/4/5, the previous
POINTER REGISTER
value written to the Pointer register determines the
The four registers are accessed by writing to the
register that is read from. To change which register is
Pointer register byte; see Figure 30
. Table 6 and
read, a new value must be written to the Pointer
Table 7 indicate the Pointer register byte map.
register. To write a new value to the Pointer register,
the master issues a slave address byte with the R/W
Table 6. Register Address
bit low, followed by the Pointer register byte. No
BIT 1
BIT 0
REGISTER
additional data need to be transmitted, and a STOP
condition can be issued by the master. The master
0
0
Conversion register
may now issue a START condition and send the
0
1
Config register
slave address byte with the R/W bit high to begin the
1
0
Lo_thresh register
read. Table 10 details this sequence. If repeated
1
1
Hi_thresh register
reads from the same register are desired, there is no
need to continually send Pointer register bytes,
because the ADS1113/4/5 store the value of the
CONVERSION REGISTER
Pointer register until it is modified by a write
The 16-bit register contains the result of the last
operation. However, every write operation requires
conversion
in
binary
twos
complement
format.
the Pointer register to be written.
Following reset or power-up, the Conversion register
is cleared to '0', and remains '0' until the first
REGISTERS
conversion is completed.
The ADS1113/4/5 have four registers that are
The register format is shown in Table 8 .
accessible via the I2C port. The Conversion register
contains the result of the last conversion. The Config
CONFIG REGISTER
register allows the user to change the ADS1113/4/5
operating modes and query the status of the devices.
The 16-bit register can be used to control the
Two registers, Lo_thresh and Hi_thresh, set the
ADS1113/4/5 operating mode, input selection, data
threshold values used for the comparator function.
rate, PGA settings, and comparator modes. The
register format is shown in Table 9 .
Table 7. Pointer Register Byte (Write-Only)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
0
0
0
Register address
Table 8. Conversion Register (Read-Only)
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NAME
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Table 9. Config Register (Read/Write)
BIT
15
14
13
12
11
10
9
8
NAME
OS
MUX2
MUX1
MUX0
PGA2
PGA1
PGA0
MODE
blank
BIT
7
6
5
4
3
2
1
0
NAME
DR2
DR1
DR0
COMP_MODE
COMP_POL COMP_LAT
COMP_QUE1
COMP_QUE0
Default = 8583h.
Bit [15]
OS: Operational status/single-shot conversion start
This bit determines the operational status of the device.
This bit can only be written when in power-down mode.
For a write status:
0 : No effect
1 : Begin a single conversion (when in power-down mode)
For a read status:
0 : Device is currently performing a conversion
1 : Device is not currently performing a conversion
18
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS1113 ADS1114 ADS1115


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