MKW01Z128 datasheet(7/67 Pages) FREESCALE

Part #	MKW01Z128

Description	Highly-integrated, cost-effective single-package solution for sub-1 GHz applications

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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MKW01Z128 Advance Information, Rev. 5

Freescale Semiconductor

7

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Low power, battery-operated standalone wireless node - a common example of this configuration

would be a remote sensor monitor. The wireless node programmed for standalone operation,

typically has a low active-mode duty cycle, and is designed for long battery life, i.e., lowest power.

•

Communication channel to a higher level controller - in this example, the wireless node

implements the lower levels of a communications stack and is subordinate to the primary

controller. Typically the MKW01 is connected to the controller through a command channel

implemented via a UART/SCI port or other serial communication port.

4.3

System Clock Configuration

The MKW01 device allows for various system clock configurations:

•

Pins 46 & 47 are provided to input a 32 or 30 MHz crystal for the transceiver reference clock source

(required) as shown in Figure 3.

•

The transceiver can be programmed to provide a programmable frequency clock output (DIO5

which alternates as CLKOUT, pin 54) that can be used as an external source to the CPU (see

Figure 3 and Figure 4). As a result, a single crystal system clock solution is possible where the

transceiver reference clock source. Routing CLKOUT to the MCU without dividing it is

recommended, but it can be divided by 2, 4, 8, 16 and 32.

•

The MCU provides a trimmable internal reference clock and also supports an external clock

source. An optional on-chip frequency locked loop (FLL) can be used with either clock source to

support a CPU clock as high as 48 MHz at 3.6 V.

•

Pins 16 and 15 are available to provide an external 32.768 kHz external clock source for the MCU.

Figure 3. MKW01 Single Crystal System Clock Connection

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