MCP3423-E/UN Microchip Technology, MCP3423-E/UN Datasheet - Page 17

• Manufacturer Part Number: MCP3423-E/UN
• Description: IC ADC 18BIT 3.75SPS 2CH 10-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP3423-E/UN

• Data Interface: I²C, Serial
• Number Of Bits: 18
• Sampling Rate (per Second): 3.75
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP (0.118", 3.00mm Width)
• Resolution (bits): 18bit
• Sampling Rate: 3.75SPS
• Input Channel Type: Differential
• Supply Voltage Range - Analog: 2.7V To 5.5V
• Supply Current: 145µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP3423EV - BOARD EVAL 18BIT 2CH ADC MCP3423
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

5.0
5.1
The user operates the device by setting up the device
configuration
(see
read command (see
The device 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
immediately 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:
© 2009 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
Figure
Operating Modes
USING THE DEVICES
CONTINUOUS CONVERSION
MODE (O/C BIT =
5-3) and reads the conversion data using a
register
Figure 5-4
using
1
a
)
and
write
Figure
command
5-5).
5.1.2
Once the One-Shot Conversion Mode (single conver-
sion) is selected, the device performs only one
conversion, 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
recommended for low power operating applications
where the conversion result is needed by request on
demand. During the low current standby mode, the
device consumes 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 approximately 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
ONE-SHOT CONVERSION MODE
(O/C BIT =
Conversion
MCP3422/3/4
0
)
Mode
DS22088C-page 17
is
highly