SN250 datasheet(13/130 Pages) STMICROELECTRONICS

13 / 130 page

SN250

Top-level functional description

13/130

the protocol timing requirements. In addition, it provides timer and synchronization

assistance for the IEEE 802.15.4 CSMA-CA algorithm.

The SN250 integrates hardware support for a Packet Trace module, which allows robust

packet-based debug. This element is a critical component of InSight Desktop, the software

IDE developed by Ember Corporation, providing advanced network debug capability when

coupled with the InSight Adapter.

The SN250 integrates a 16-bit XAP2b microprocessor developed by Cambridge

Consultants Ltd. This power-efficient, industry-proven core provides the appropriate level of

processing power to meet the needs of ZigBee applications. In addition, 128KB of Flash and

5KB of SRAM comprise the program and data memory elements, respectively. The SN250

employs a configurable memory protection scheme usually found on larger microcontrollers.

In addition, the SIF module provides a non-intrusive programming and debug interface

allowing for real-time application debugging.

The SN250 contains 17 GPIO pins shared with other peripheral (or alternate) functions.

Flexible routing within the SN250 lets external devices utilize the alternate functions on a

variety of different GPIOs. The integrated Serial Controller SC1 can be configured for SPI

(master-only), I2C (master-only), or UART functionality, and the Serial Controller SC2 can

be configured for SPI (master or slave) or I2C (master-only) operation.

The SN250 has an ADC integrated which can sample analog signals from four GPIO pins

single-ended or differentially. In addition, the unregulated voltage supply VDD_PADS,

regulated supply VDD_PADSA, voltage reference VREF, and GND can be sampled. The

integrated voltage reference VREF for the ADC can be made available to external circuitry.

The integrated voltage regulator generates a regulated 1.8V reference voltage from an

unregulated supply voltage. This voltage is decoupled and routed externally to supply the

1.8V to the core logic. In addition, an integrated POR module allows for the proper cold start

of the SN250.

The SN250 contains one high-frequency (24MHz) crystal oscillator and, for low-power

operation, a second low-frequency oscillator (either an internal 10kHz RC oscillator or an

external 32.768kHz crystal oscillator).

The SN250 contains two power domains. The always-powered High Voltage Supply is used

for powering the GPIO pads and critical chip functions. The rest of the chip is powered by a

regulated Low Voltage Supply which can be disabled during deep sleep to reduce the power

consumption.

SN250 数据表(PDF) 13 Page - STMicroelectronics

SN250 数据表(HTML) 13 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载