BC2102 Datasheet, PDF (7/15 Pages) Holtek Semiconductor Inc – Sub-1GHz OOK/FSK Transmitter

BC2102
I²C Mode
If the device is connected to an external MCU, then
the I²C mode can be used. When the SCL line (Pin 5)
is pulled low for more than 16μs (t_ENI2C), the device
will enter the I²C Mode from the Normal Mode, dur-
ing which the external control register can configure
the special function registers in the device using I²C
commands. When the device receives a correct I²C
STOP signal followed by the SCL line being pulled
low for more than 16μs, the device will return to the
Normal Mode.
In the I²C Mode, the MCU can configure the internal
relevant registers using I²C serial programming. The
transmitter only supports the I²C format for byte
write, page write, byte read and page read format. The
transmission procedure is shown as below.
Symbol definition:
• S: Start symbol
• RS: Repeat Start
• P: Stop symbol
• DADDR[6:0]: device address, 21h
• R/W: read write select, R(0): write, (1): read
• RADDR[7:0]: register address
• ACK: A(0):ACK, NA(1):NAK
• Bus Direction:
host to device:
device to host:
PCLK/SCL
DIN/SDA
>16μS
t_ENI2C
I²C
Start Condition
I²C
>16μS
Stop Condition
t_EXI2C
ACK
Normal Mode into I²C Mode
I²C Serial Programming
I²C Serial Programming
I²C Mode Terminate
Byte Write
S DADDR[6:0] W A RADDR[7:0] A
DATA
AP
Page Write
S DADDR[6:0] W A RADDR[7:0] A
DATA
A DATA(n+1) A DATA(n+x) A P
Byte Read
S DADDR[6:0]
WA
RADDR[7:0]
A RS DADDR[6:0]
RA
DATA
NA P
Page Read
S DADDR[6:0]
WA
RADDR[7:0]
A RS DADDR[6:0]
RA
DATA(n)
A DATA(n+1) A DATA(n+x) NA P
Rev. 1.00
7
December 21, 2016