MCP3901 데이터 시트보기 (PDF) - Microchip Technology
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MCP3901 Datasheet PDF : 62 Pages
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MCP3901
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Symbol
Pin No.
SSOP
QFN
Function
RESET
1
DVDD
2
AVDD
3
CH0+
4
CH0-
5
CH1-
6
CH1+
7
AGND
8
REFIN+/OUT
9
REFIN-
10
DGND
11
MDAT1
12
MDAT0
13
DR
14
OSC1/CLKI
15
OSC2
16
CS
17
SCK
18
SDO
19
SDI
20
EP
—
18
Master Reset Logic Input Pin
19
Digital Power Supply Pin
20
Analog Power Supply Pin
1
Non-Inverting Analog Input Pin for Channel 0
2
Inverting Analog Input Pin for Channel 0
3
Inverting Analog Input Pin for Channel 1
4
Non-Inverting Analog Input Pin for Channel 1
5
Analog Ground Pin, Return Path for Internal Analog Circuitry
6
Non-Inverting Voltage Reference Input and Internal Reference Output Pin
7
Inverting Voltage Reference Input Pin
8
Digital Ground Pin, Return Path for Internal Digital Circuitry
9
Modulator Data Output Pin for Channel 1
10
Modulator Data Output Pin for Channel 0
11
Data Ready Signal Output Pin
12
Oscillator Crystal Connection Pin or External Clock Input Pin
13
Oscillator Crystal Connection Pin
14
Serial Interface Chip Select Pin
15
Serial Interface Clock Pin
16
Serial Interface Data Output Pin
17
Serial Interface Data Input Pin
21
Exposed Thermal Pad. Must be connected to AGND.
3.1 RESET
This pin is active low and places the entire chip in a
Reset state when active.
When RESET = 0, all registers are reset to their default
value, no communication can take place and no clock
is distributed inside the part. This state is equivalent to
a POR state.
Since the default state of the ADCs is on, the analog
power consumption when RESET = 0 is equivalent to
when RESET = 1. Only the digital power consumption
is largely reduced because this current consumption is
essentially dynamic and is reduced drastically when
there is no clock running.
All the analog biases are enabled during a Reset so
that the part is fully operational just after a RESET
rising edge.
This input is Schmitt triggered.
3.2 Digital VDD (DVDD)
DVDD is the power supply pin for the digital circuitry
within the MCP3901. This pin requires appropriate
bypass capacitors and should be maintained between
2.7V and 5.5V for specified operation.
3.3 Analog VDD (AVDD)
AVDD is the power supply pin for the analog circuitry
within the MCP3901.
This pin requires appropriate bypass capacitors and
should be maintained to 5V ±10% for specified
operation.
© 2011 Microchip Technology Inc.
DS22192D-page 15
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