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Pin Assignments and Functions

This section describes the pin assignments and pin functions.

Pin assignments

CRMXchip Pinout

Pin functions

Pin Name Pin type Description
1 VDD Power Power supply (3.3V)
2 N.C. No connection Do not connect
3 IRQ Digital output Interrupt signal, active low
4 CS Digital input Chip select, active low
5 SCK Digital input SPI clock
6 MOSI Digital input SPI Master Out, Slave In
7 MISO Digital output SPI Master In, Slave Out
8 DMX_TXD Digital output DMX TXD
9 RS485_DE Digital output RS485 driver control signal
10 RS485_RE Digital output RS485 driver control signal
11 DMX_RXD Digital input DMX RXD (3.3 V max)
12 VDD Power Power supply (3.3V)
13 VSS Power Ground (0V)
14 RDI_LVL0 Digital output Radio level LED
15 RDI_LVL1 Digital output Radio level LED
16 RDI_LVL2 Digital output Radio level LED
17 RDI_LVL3 Digital output Radio level LED
18 RDI_LVL4 Digital output Radio level LED
19 N.C. No connection Do not connect
20 DMX_LED Digital output DMX LED
21 LINKED Digital output Linked to transmitter LED
22 RF_LINK Digital output RF link LED
23 RESET Reset Chip reset, active low
24 N.C. No connection Do not connect
25 N.C. No connection Do not connect
26 N.C. No connection Do not connect
27 N.C. No connection Do not connect
28 N.C. No connection Do not connect
29 CAP1 Analog output Capacitor connection
30 RF_BIAS Analog output RF circuitry biasing
31 RF1 RF Differential antenna connection
32 RF2 RF Differential antenna connection
33 VSS Power Ground (0V)
34 VSS Power Ground (0V)
35 VDD Power Power supply (3.3V)
36 VDD Power Power supply (3.3V)
37 XTAL1 Analog input Connection for 16 MHz crystal or 16 MHz clock reference
38 XTAL2 Analog output Connection for 16 MHz crystal
39 CAP2 Analog output Capacitor connection
40 N.C. No connection Do not connect
41 N.C. No connection Do not connect
42 N.C. No connection Do not connect
43 N.C. No connection Do not connect
44 N.C. No connection Do not connect
45 LINK_SW Digital input Link control switch input
46 STATUS_LED Digital output Status LED
47 N.C. No connection Do not connect
48 N.C. No connection Do not connect
SLUG GND Power Must be connected to Ground (0V)