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MCP2515
9.0
RESET
The MCP2515 differentiates between two Resets:
1.
2.
Hardware Reset – Low on RESET pin
SPI Reset – Reset via SPI command
Both of these Resets are functionally equivalent. It is
important to provide one of these two Resets after
power-up to ensure that the logic and registers are in
their default state. A hardware Reset can be achieved
automatically by placing an RC on the RESET pin (see
Figure 9-1 ). The values must be such that the device is
held in Reset for a minimum of 2 μs after V DD reaches
operating voltage, as indicated in the electrical
specification (t RL ).
FIGURE 9-1:
RESET PIN CONFIGURATION EXAMPLE
V DD
V DD
D (1)
R
R1 (2)
RESET
C
Note 1: The diode D helps discharge the capacitor quickly when V DD powers down.
2: R1 = 1 k ? to 10 k ? will limit any current flowing into RESET from external
capacitor C, in the event of RESET pin breakdown due to Electrostatic
Discharge (ESD) or Electrical Overstress (EOS).
? 2003-2012 Microchip Technology Inc.
DS21801G-page 57
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