MCP3551DM-PCTL Microchip Technology, MCP3551DM-PCTL Datasheet - Page 16

• Manufacturer Part Number: MCP3551DM-PCTL
• Description: BOARD DEMO FOR MCP3551
• Manufacturer: Microchip Technology
• Series: PICtail™r

Specifications of MCP3551DM-PCTL

• Number Of Adc's: 1
• Number Of Bits: 22
• Sampling Rate (per Second): 14
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: ±VREF
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP3551
• Processor To Be Evaluated: MCP3551
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

MCP3550/1/3
Once a power-up event has occurred, the device must
require additional time before a conversion can take
place. During this time, all internal analog circuitry must
settle before the first conversion can occur. An internal
timer counts 32 internal clock periods before the
internal oscillator can provide clock to the conversion
process. This allows all internal analog circuitry to
settle to their proper operating point. This timing is
typically less than 300 µs, which is negligible compared
to one conversion time (e.g. 72.7 ms for the
MCP3551). Figure 4-6 illustrates the conditions for a
power-up and power-down event under typical start-up
conditions.
FIGURE 4-6:
4.7
When not internally converting, the two modes of
operation for the MCP3550/1/3 devices are the
Shutdown and Sleep modes. During Shutdown mode,
all internal analog circuitry, including the POR, is turned
off and the device consumes less than 1 µA. When
exiting Shutdown mode, the device must require addi-
tional time before a conversion can take place. During
this time, all internal analog circuitry must settle before
the first conversion can occur. An internal timer counts
32 internal clock periods before the internal oscillator
can provide clock to the conversion process. This
allows all internal analog circuitry to settle to their
proper operating point. This timing is typically less than
300 µs, which is negligible compared to one conversion
time (72.7 ms for MCP3551).
DS21950D-page 16
V
2.2V
2.0V
DD
0V
Shutdown Mode
Reset
Start-up
300 µs
Power-On Reset Operation.
Operation
Normal
Reset
Time
4.8
During Sleep mode, the device is not converting and is
awaiting data retrieval; the internal analog circuitry is
still running and the device typically consumes 10 µA.
In order to restart a conversion while in Sleep mode,
toggling CS to a logic-high (placing the part in Shut-
down mode) and then back to a logic-low will restart the
conversion. Sleep can only be entered in Single
Conversion mode. Once a conversion is complete in
Single Conversion mode, the device automatically
enters Sleep mode.
Sleep Mode
© 2007 Microchip Technology Inc.