Datasheet

 2003-2012 Microchip Technology Inc. DS21801G-page 57
MCP2515
9.0 RESET
The MCP2515 differentiates between two Resets:
1. Hardware Reset – Low on RESET
pin
2. 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 VDD reaches
operating voltage, as indicated in the electrical
specification (tRL).
FIGURE 9-1: RESET PIN CONFIGURATION EXAMPLE
RESET
R1
(2)
VDD
VDD
R
C
D
(1)
Note 1: The diode D helps discharge the capacitor quickly when VDD 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).