Circuit diagram

Mechanical dimensions and component placement

The CC1000PP module measures 28x20mm, and has been designed for a two-sided 1.6mm thick PCB using industry-standard FR-4 board material. Components are mounted on only one side, and the result is a very small, inexpensive module that can satisfy regulation requirements.

On each end of the board are connectors for interfacing the module to an external system. An external antenna, and a 2.1-3.6V power supply should be connected to the top connector

(P2). The RSSI/IF signal can also be accessed via this connector. The lower connector (P1) can be used to connect an external micro-controller to the data- and configuration interface of the CC1000.

Figure 1. Mechanical drawing of CC1000PP module (not to scale)

To ensure optimum RF performance, an external antenna should be soldered directly to the antenna terminals, or a 50 Ohm microstrip line should be used from the antenna terminal to the external antenna connector. For applications not demanding optimum RF performance, a pin-row connector may be used to connect the antenna signal to another PCB, but be aware that this can lead to non-optimal sensitivity and output power, and that measurements using this arrangement should not be used to characterise the RF performance of CC1000. For more information on antennas, please see Chipcon application note AN003.

The circuit diagram of the CC1000PP is shown below. There are two versions of the CC1000PP module, the CC1000PP-433 for 433 MHz operation, and the CC1000PP-868 for operation in the 868 MHz and 902-928 MHz bands. Since the 868 version covers both the European 868 MHz band and the US 902-928 MHz band, one system can be used in both Europe and the US using the same hardware, changing the frequency by software control.

The circuit is similar to the application circuit shown in the CC1000 data sheet, with an added LC filter to reduce emitted harmonics.

SWRU060

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