TDK blu2i 用户手册
3.1 Electric Characteristics
Function Signal Name Pin No
I/O
Signal level
Comments
Power
Supply
Supply
Vcc
29
I
3.6V to 6V
Ityp = 50mA
GND 11,
15,
18, 30,
36, 38
36, 38
6
Ground
terminals to
be attached
in parallel
be attached
in parallel
RS232
Interface
Interface
UART_TX 21 O V
OL
max=0.2V
V
OH
min=2.8V
UART_RX
25
I
V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
UART_CTS
19
I
V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
UART_RTS
23
O
V
OL
max=0.2V
V
OH
min=2.8V
UART_DSR
10
I
V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
UART_DTR
12
O
V
OL
max=0.2V
V
OH
min=2.8V
Shared with
GPIO3
GPIO3
UART_RI
6
I
or
O
O/P : V
OL
max=0.2V
V
OH
min=2.8V
I/P : V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
Direction
may be
programme
d.
may be
programme
d.
UART_DCD
8
I
or
O
O/P : V
OL
max=0.2V
V
OH
min=2.8V
I/P : V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
Direction
may be
programme
d.
may be
programme
d.
External
Power
Supply
Power
Supply
VCC_1V8 39 O 1.8V
typical
For
monitoring
only. No
current
source
monitoring
only. No
current
source
VCC_3V3
27
O
3.3V
typical
SPI Bus
SPI_MOSI
17
I
V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
Used to
reprogram
Flash
reprogram
Flash
SPI_MISO
5
O
V
OL
max=0.2V
V
OH
min=2.8V
SPI_CSB
7
I
V
IL
max=0.8V
V
IH
min=2.10V
V
IH
max=3.7V
SPI_CLK
9
I
V
IL
max=0.8V
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