MCP25025-E/SL Microchip Technology, MCP25025-E/SL Datasheet - Page 50

• Manufacturer Part Number: MCP25025-E/SL
• Description: CAN I/O Expander Family, -40C to +125C, 14-SOIC 150mil, TUBE
• Manufacturer: Microchip Technology

MCP2502X/5X
8.7
The MCP2502X/5X can be serially programmed while
in the end application circuit. This is simply done with
two lines for clock and data, and three other lines for
power, ground and the programming voltage. This
allows customers to manufacture
unprogrammed devices and then program the device
just before shipping the product, also allowing the
most recent firmware (or a custom firmware) to be
programmed.
The device is placed into a program/verify mode by
holding the GP4 and GP5 pins low while raising GP7
(V
programming specification, “MCP250XX In-Circuit
Serial Programming™ (ICSP)”, DS20072, for more
information). GP4 becomes the programming data and
GP5 becomes the programming clock. Both GP4 and
GP5 are Schmitt Trigger inputs in this mode. The signal
definitions are summarized in Table 8-1
TABLE 8-1:
DS21664D-page 50
Pin Name
PP
GP4
GP5
GP7
V
V
) pin from V
SS
DD
In-Circuit Serial Programming
Number
Pin
14
11
IN-CIRCUIT SERIAL
7
5
6
PROGRAMMING PIN
FUNCTIONS
IL
to V
IH
Programming Mode
(see the MCP2502X/5X
Function
Ground
Power
Clock
Data
V
PP
boards with
© 2007 Microchip Technology Inc.