imp003 Pin Mux

The imp003 (Murata part number LBWA1ZV1CD) offers a broad array of IO options.

Pin Mux

Pin	uart FG	uart QRPW	uart UVGD	uart WJ	uart DM	i2c FG	i2c AB	spi EBCA	spi LGDK	DAC	ADC	PWM	Pulse Count	Wake From Sleep	State Change Callback	PTPG Trigger
A							SCL	CS^*		Yes	Yes				Yes
B							SDA	CIPO			Yes	Yes			Yes
C								SCLK		Yes	Yes	Yes			Yes
D			CTS		TX				SCLK						Yes
E								COPI			Yes	Yes			Yes	For C
F	TX					SCL					Yes	Yes				For K,X
G	RX		RTS			SDA			CIPO						Yes
H											Yes
J				RX							Yes
K									CS^*		Yes	Yes
L									COPI			Yes				For G
M					RX							Yes	Yes		Yes	For D
N											Yes
P		RTS													Yes
Q		TX													Yes
R		RX													Yes
S
T															Yes
U			TX												Yes
V			RX												Yes
W		CTS		TX							Yes			Yes	Yes
X															Yes
Y

^*CS is driven by the SPI controller in certain SPI modes (byte sync) and may be used to implement SPI peripheral operation.

Notes

imp003 Identification

Call imp.info(). This returns a meta object with the property type, which is is a string containing the imp module name:

if (imp.info().type == "imp003") {
  // Code running on imp003/Murata LBWA1ZV1CD...
}

Default Pin States

All of the imp003’s pins are tri-stated (floating) by default, ie. on power on, after chip reset, or after deep sleep.

ADC

The imp003 has ten ADC-capable pins but can currently only sample from no more than eight of these at a time. This issue is scheduled to be addressed in a future impOS release.

Standard Buses

The imp003 provides five separate UART, two I²C and two SPI buses, in addition to being able to use space in the system-controlled SPI flash — in most cases, you will not need to use one of the GPIO pins’ SPI buses to attach extra storage to the imp003.

CIPO was previously referred to as MISO. COPI was previously referred to as MOSI.

Pin State-change Callbacks

Not all of the imp003’s pins, when assigned as digital inputs, can be supplied with callback functions that will be triggered when the pin’s state changes. The imp003 pins able to be configured with a callback — using the pin.configure() API call — are listed above. Attempts to nominate a callback for any of the remaining pins will cause an exception to be thrown.

Pulse Count Pin

The imp003 has a single Pulse Count pin: pin M.

Wakeup Pin

The imp003’s wakeup pin, pin W, can be used to wake the imp from a deep sleep, but only if the pin is configured with this capability before the imp goes into deep sleep. To configure the pin for this role, use the following code:

hardware.pinW.configure(DIGITAL_IN_WAKEUP);

Once the imp is in deep sleep — typically with a server.sleepfor() or server.sleepuntil() call — setting pin W to logic high will wake the device. The imp wakes when the pin is high, not on the rising edge. The external device responsible for triggering the wakeup pin should subsequently drive the pin low; the imp cannot return to sleep if the wakeup pin is already high. An internal pull-down is automatically enabled when wakeup is configured.

The Functions Available From The imp003’s Pins