Filter
Top Products
3.1 Electric Characteristics
Function Signal Name Pin No I/O Signal level Comments
Power
Supply
Vcc 29 I 3.6V to 6V Ityp = 50mA
GND 11, 15,
18, 30,
36, 38
6 Ground
terminals to
be attached
in parallel
RS232
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
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.
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.
External
Power
Supply
VCC_1V8 39 O 1.8V typical For
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
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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