MCP3901A0-I/SS Microchip Technology, MCP3901A0-I/SS Datasheet - Page 46

• Manufacturer Part Number: MCP3901A0-I/SS
• Description: IC AFE 24BIT 64KSPS 20-SSOP
• Manufacturer: Microchip Technology

Specifications of MCP3901A0-I/SS

• Number Of Bits: 24
• Number Of Channels: 2
• Power (watts): 10mW
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 2.7 V ~ 5.5 V
• Package / Case: 20-SSOP
• Ic Function: Analog Front End Device IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 20
• Supply Voltage Max: 5.5V
• Output Voltage: 0.4 V
• Output Power: 14 mW
• Input Voltage: 4.5 V to 5.5 V, 2.7 V to 5.5 V
• Switching Frequency: 4 MHz
• Mounting Style: SMD/SMT
• Number Of Outputs: 2
• No. Of Channels: 2
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP3901AO-I/SS; MCP3901AO-I/SS

MCP3901
7.5
This register contains all settings related to the
communication including data ready settings and
status, and read mode settings.
7.5.1
This bit determines if the first data ready pulses
correspond to settled data or unsettled data from each
SINC
every DRCLK period. If this bit is set, unsettled data will
wait for 3 DRCLK periods before giving DR pulses and
will then give DR pulses every DRCLK period.
7.5.2
This bit defines the non-active state of the data ready
pin (logic 1 or high impedance). Using this bit, the user
can connect multiple chips with the same DR pin with a
pull up resistor (DR_HIZN=0) or a single chip with no
external component (DR_HIZN=1).
7.5.3
If one of the channels is in reset or shutdown, only one
of the data ready pulses is present and the situation is
similar to DRMODE = 01 or 10. In the 01,10 and 11
modes, the ADC channel data to be read is latched at
the beginning of a reading, in order to prevent the case
of erroneous data when a DR pulse happens during a
read. In these modes the two channels are
independent.
When these bits are equal to 11,10 or 01, they control
which ADC’s data ready is present on the DR pin.
When DRMODE=00, the data ready pin output is syn-
chronized with the lagging ADC channel (defined by
the PHASE register), and the ADCs are linked together.
In this mode, the output of the two ADCs are latched
synchronously at the moment of the DR event. This
prevents from having bad synchronization between the
two ADCs. The output is also latched at the beginning
of a reading in order not to be updated during a read
and not to give erroneous data.
This mode is very useful for power metering
applications because the data from both ADCs can be
retrieved using this single data ready event and
processed synchronously even in case of a large
phase difference. This mode works as if there was one
ADC channel and its data would be 48 bits long and
contain both channel data. As a consequence, if one
channel is in reset or shutdown when DRMODE=00, no
data ready pulse will be present at the outputs (if both
channels are not ready in this mode, the data is not
considered as ready).
DS22192B-page 46
3
filter. Unsettled data will provide DR pulses
Status and Communication
Register
DATA READY (DR) LATENCY
CONTROL - DR_LTY
DATA READY (DR) PIN HIGH Z -
DR_HIZN
DATA READY MODE -
DRMODE<1:0>
See Section 6.9 “Data Ready Pin (DR)” for more
details about data ready pin behavior.
7.5.4
These bits indicate the DR status of both channels
respectively. These flags are set to logic high after each
read of the STATUS/COM register. These bits are
cleared when a DR event has happened on its
respective ADC channel. Writing these bits has no
effect.
Note:
DR STATUS FLAG -
DRSTATUS<1:0>
These bits are useful if multiple devices
share
(DR_HIZN=0) in order to understand from
which device the DR event has happened.
This configuration can be used for
three-phase power metering systems
where all three phases share the same
data ready pin. In case the DRMODE=00
(Linked ADCs), these data ready status
bits will be updated synchronously upon
the same event (lagging ADC is ready).
These bits are also useful in systems
where the DR pin is not used to save MCU
I/O.
the
© 2009 Microchip Technology Inc.
same
DR
output
pin