Computime Limited CT-EM2503 Manual Do Utilizador
CT-EM250
ZigBee-Ready RF Transceiver Modules
Computime Ltd. All rights reserved
Confidential
Page 6 of 15
Pin Description
Pin# Signal
Direction Description
1
SIF_MISO
O
Serial interface, master in/slave out
2 SIF_MOSI
I
Serial
interface, master out/slave in
3
SIF_LOADB I/O
Serial interface, load strobe (open-collector with internal pull-up)
4 GND
Ground
Ground
supply
5 GPIO16
I/O
Digital I/O
Enable GPIO16 with GPIO_CFG[3]
6 GPIO15
I/O
Digital I/O
Enable GPIO15 with GPIO_CFG[2]
7 GPIO14
I/O
Digital I/O
Enable GPIO14 with GPIO_CFG[1]
8 GPIO13
I/O
Digital I/O
Enable GPIO13 with GPIO_CFG[0]
9 GND
Ground
Ground
supply
10 GND
Ground Ground
supply
11 ANT
I/O
receiver
input/transmitter output
12 GND
Ground Ground
supply
13
nRESET
I
Active low chip reset (internal pull-up)
14
OSCB
I/O
24MHz crystal oscillator or left open when using external clock input on
OSCA
15
OSCA
I/O
24MHz crystal oscillator or external clock input
16
VBRD
Power
Pads supply (2.1-3.6V)
17 GPIO11 I/O
Digital I/O
Enable GPIO11 with GPIO_CFG[7:4]
18 GPIO12 I/O
Digital I/O
Enable GPIO12 with GPIO_CFG[7:4]
19 GPIO0
I/O
Digital I/O
Enable GPIO0 with GPIO_CFG[7:4]
20 GPIO1
I/O
Digital I/O
Enable GPIO1 with GPIO_CFG[7:4]
21 GPIO2
I/O
Digital
I/O