Datasheet

ADS1255
ADS1256
SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
www.ti.com
29
0.1
μ
F
+5V
10k
Ω
2.5V
Input
47
μ
F 0.1
μ
F 100
μ
F
1
μ
F
OPA350
To VREFP
Pin4of
the ADS1255/6
Figure 26. Recommended Voltage Reference Buffer Circuit
DIGITAL INTERFACE CONNECTIONS
The ADS1255/6 5V tolerant SPI-, QSPI™, and
MICROWIRE™-compatible interface easily connects to a
wide variety of microcontrollers. Figure 27 shows the basic
connection to TI’s MSP430 family of low-power
microcontrollers. Figure 28 shows the connection to
microcontrollers with an SPI interface like TI’s MSC12xx
family or the 68HC11 family. Note that the MSC12xx
includes a high-resolution A/D converter; the ADS1255/6
can be used to add additional channels of measurement
or provide higher-speed conversions. Finally, Figure 29
shows how to connect the ADS1255/6 to an 8xC51 UART
in serial mode 0 in a 2-wire configuration. Avoid using the
continuous read mode (RDATAC) when DIN and DOUT
are connected together.
DIN
DOUT
DRDY
SCLK
CS
(1)
ADS1255
ADS1256
(1) CS may be tied low.
P1.3
P1.2
P1.0
P1.6
P1.4
MSP430
Figure 27. Connection to MSP430
Microcontroller
DIN
DOUT
DRDY
SCLK
CS
(1)
ADS1255
ADS1256
(1) CS may be tied low.
MOSI
MISO
INT
SCK
IO
MSC12xx or
68HC11
Figure 28. Connection to Microcontrollers with
an SPI Interface
DIN
DOUT
DRDY
SCLK
CS
ADS1255
ADS1256
P3.0/RXD
P3.1xTXD
DGND
8xC51
Figure 29. Connection to 8xC51 Microcontroller
UART with a 2-Wire Interface