SN260Q STMicroelectronics, SN260Q Datasheet - Page 20

• Manufacturer Part Number: SN260Q
• Description: IC ZIGBEE/802.15.4 PROC 40-QFN
• Manufacturer: STMicroelectronics

Specifications of SN260Q

• Frequency: 2.4GHz
• Modulation Or Protocol: 802.15.4
• Applications: ZigBee™
• Power - Output: -32dBm ~ 5dBm
• Sensitivity: -97.5dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 35.5mA
• Current - Transmitting: 35.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-QFN
• For Use With: 497-6404 - BOARD EVAL SPZB260 MOD FOR STR9497-5990 - KIT EVAL REVA FOR ZIGBEE497-5879 - NETWORK DEVELOPMENT FOR SN260497-5877 - KIT RADIO CARRIER FOR SN260
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Data Rate - Maximum: -

Functional description
6.11.2
6.12
20/47
Table 5.
Internal RC oscillator
The SN260 has a low-power, low-frequency RC oscillator that runs all the time. Its nominal
frequency is 10 kHz.
The RC oscillator has a coarse analog trim control, which is first adjusted to get the
frequency as close to 10 kHz as possible. This raw clock is used by the chip management
block. It is also divided down to 1kHz using a variable divider to allow software to accurately
calibrate it. This calibrated clock is used by the sleep timer.
Timekeeping accuracy depends on temperature fluctuations the chip is exposed to, power
supply impedance, and the calibration interval, but in general it will be better than 150 ppm
(including crystal error of 40 ppm).
Table 6
Table 6.
Random number generator
The SN260 allows for the generation of random numbers by exposing a randomly generated
bit from the RX ADC. Analog noise current is passed through the RX path, sampled by the
receive ADC, and stored in a register. The value contained in this register could be used to
seed a software-generated random number. The EmberZNet stack utilizes these random
numbers to seed the random MAC backoff and encryption key generators.
Crystal ESR
Crystal ESR
Start-up time to stable
clock (max. bias)
Start-up time to stable
clock (optimum bias)
Current consumption
Current consumption
Current consumption
Frequency
Analog trim steps
Frequency variation with supply
Parameter
lists the specifications of the RC oscillator.
Parameter
High-frequency crystal specifications (continued)
RC oscillator specifications
Load capacitance of 10pF
Load capacitance of 18pF
Good crystal: 20Ω ESR, 10pF load
Worst-case crystals (60Ω, 18pF or
100Ω, 10pF)
At maximum bias
For a voltage drop from 3.6V
to 3.1V or 2.6V to 2.1V
Test conditions
Test conditions
Min.
Min.
Typ.
0.2
Typ.
0.75
10
1
Max.
100
0.3
0.5
60
1
2
1
Max.
1.5
Unit
SN260
mA
mA
mA
ms
ms
Ω
Ω
Unit
kHz
kHz
%