MCP3422 Microchip Technology Inc., MCP3422 Datasheet - Page 17
![no-image](/images/manufacturer_photos/0/4/440/microchip_technology_inc__sml.jpg)
MCP3422
Manufacturer Part Number
MCP3422
Description
18-bit, Multi-channel ?? Analog-to-digital Converter With I2c? Interface And On-board Reference
Manufacturer
Microchip Technology Inc.
Datasheet
1.MCP3422.pdf
(56 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCP3422A0-E/SN
Manufacturer:
ROHM
Quantity:
21 000
Part Number:
MCP3422A0-E/SN
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Company:
Part Number:
MCP3422A0T-E/MC
Manufacturer:
MICROCHIP
Quantity:
1 929
Company:
Part Number:
MCP3422A0T-E/MS
Manufacturer:
MICROCHIP
Quantity:
1 000
Company:
Part Number:
MCP3422A0T-E/SN
Manufacturer:
NICHICON
Quantity:
30 000
5.0
5.1
The user operates the device by setting up the device
configuration register using a write command (see
Figure
command (see
operates in two modes: (a) Continuous Conversion
Mode or (b) One-Shot Conversion Mode (single
conversion). This mode selection is made by setting
the O/C bit in the Configuration Register. Refer to
Section 5.2 “Configuration Register” for more
information.
5.1.1
The device performs a Continuous Conversion if the
O/C bit is set to logic “high”. Once the conversion is
completed, RDY bit is toggled to ‘0’ and the result is
placed at the output data register. The device immedi-
ately begins another conversion and overwrites the
output data register with the most recent result. The
device clears the data ready flag (RDY bit = 0) when
the conversion is completed. The device sets the ready
flag bit (RDY bit = 1), if the latest conversion result has
been read by the Master.
• When writing configuration register:
• When reading conversion data:
© 2008 Microchip Technology Inc.
- Setting RDY bit in continuous mode does not
- RDY bit = 0 means the latest conversion
- RDY bit = 1 means the conversion result is
affect anything.
result is ready.
not updated since the last reading. A new
conversion is under processing and the RDY
bit will be cleared when the new conversion
result is ready.
5-3) and reads the conversion data using a read
Operating Modes
USING THE DEVICES
CONTINUOUS CONVERSION
MODE (O/C BIT =
Figure 5-4
and
Figure
1
)
5-5). The device
5.1.2
Once the One-Shot Conversion (single conversion)
Mode is selected, the device performs only one conver-
sion, updates the output data register, clears the data
ready flag (RDY = 0), and then enters a low power
standby mode. A new One-Shot Conversion is started
again when the device receives a new write command
with RDY = 1.
• When writing configuration register:
• When reading conversion data:
This One-Shot Conversion Mode is highly recom-
mended for low power operating applications where the
conversion result is needed by request on demand.
During the low current standby mode, the device con-
sumes less than 1 µA maximum (or 300 nA typical).
For example, if the user collects 18 bit conversion data
once a second in One-Shot Conversion mode, the
device draws only about one fourth of its total operating
current. In this example, the device consumes approx-
imately 36 µA (135 µA / 3.75 SPS = 36 µA), if the
device performs only one conversion per second
(1 SPS) in 18-bit conversion mode with 3V power
supply.
- The RDY bit needs to be set to begin a new
- RDY bit = 0 means the latest conversion
- RDY bit = 1 means the conversion result is
conversion in one-shot mode.
result is ready.
not updated since the last reading. A new
conversion is under processing and the RDY
bit will be cleared when the new conversion is
done.
ONE-SHOT CONVERSION MODE
(O/C BIT =
MCP3422/3/4
0
)
DS22088B-page 17