资料介绍
The I2C (Inter-IC) bus has become a popular serial bus architecture
which needs to be understood for proper implementation. On the
hardware level, I2C is a collection of microcomputers with integrated
I2C port (Philips PCD33xx, PCF84Cxxx, and many of their 80(C)51
family derivatives, plus mCs from several other manufacturers), and
a peripheral set (LCD/LED drivers, RAM, ROM, E2PROM,
Clock/Calendars, I/O, A/D, D/A, IR transcoders, frequency
synthesizers, audio processors, telephony ICs and various tuning
ICs for TV/radio). These devices all communicate serially over a
two-wire bus, serial data (SDA) and serial clock (SCL). The I2C
structure is optimized for hardwire simplicity. Parallel address and
data buses inherent in conventional systems are replaced by a
serial protocol that transmits both address and bidirectional data
over a 2-wire bus. This means that interconnecting wires are
reduced to a minimum; only VDD, ground, and the two-wire bus are
required to link the controller(s) with the peripherals or other
controllers. This results in reduced IC size, reduced pin count, and
simpler interconnections. An I2C system is therefore smaller,
simpler, and cheaper to implement than its parallel counterpart.
which needs to be understood for proper implementation. On the
hardware level, I2C is a collection of microcomputers with integrated
I2C port (Philips PCD33xx, PCF84Cxxx, and many of their 80(C)51
family derivatives, plus mCs from several other manufacturers), and
a peripheral set (LCD/LED drivers, RAM, ROM, E2PROM,
Clock/Calendars, I/O, A/D, D/A, IR transcoders, frequency
synthesizers, audio processors, telephony ICs and various tuning
ICs for TV/radio). These devices all communicate serially over a
two-wire bus, serial data (SDA) and serial clock (SCL). The I2C
structure is optimized for hardwire simplicity. Parallel address and
data buses inherent in conventional systems are replaced by a
serial protocol that transmits both address and bidirectional data
over a 2-wire bus. This means that interconnecting wires are
reduced to a minimum; only VDD, ground, and the two-wire bus are
required to link the controller(s) with the peripherals or other
controllers. This results in reduced IC size, reduced pin count, and
simpler interconnections. An I2C system is therefore smaller,
simpler, and cheaper to implement than its parallel counterpart.
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