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| 型号： | EM250-RCM-R |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 26/124页 |
| 文件大小： | 0K |
| 描述： | EM250 RCM BOARD |
| 标准包装： | 12 |
| 类型： | 收发器，802.15.4/Zigbee |
| 频率： | 2.4GHz |
| 适用于相关产品： | EM250 |
| 其它名称： | 636-1023 |
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EM250
4.14 Sleep Timer
The 16-bit sleep timer is contained in the always-powered digital block. It has the following features:
?
?
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Two output compare registers, with interrupts
Only Compare A Interrupt generates Wake signal
Further clock divider of 2 N , for N = 0 to 10
The clock source for the sleep timer can be either the 32.768 kHz clock or the calibrated 1kHz clock (see
Table 15). After choosing the clock source, the frequency is slowed down with a 2 N prescaler to generate the
final timer clock (see Table 16). Legal values for N are 0 to 10. The slowest rate the sleep timer counter wraps
is 2 16 * 2 10 / 1kHz ≈ 67109 sec. ≈ about 1118.48 min. ≈ 18.6 hrs.
Table 15. Sleep Timer Clock Source Selection
CLK_SEL
0
1
CLK_DIV[3:0]
N = 0..10
N = 11..15
Clock Source
Calibrated 1kHz clock
32.768kHz clock
Table 16. Sleep Timer Clock Source Prescaling
Clock Source Prescale Factor
2 N
2 10
The EmberZNet PRO software allows the application to define the clock source and prescaler value.
Therefore, a programmable sleep/wake duty cycle can be configured according to the application
requirements.
4.15 Power Management
The EM250 supports three different power modes: processor ACTIVE, processor IDLE, and DEEP SLEEP.
The IDLE power mode stops code execution of the XAP2b until any interrupt occurs or an external SIF wakeup
command is seen. All peripherals of the EM250 including the radio continue to operate normally.
The DEEP SLEEP power mode powers off most of the EM250 but leaves the critical chip functions, such as the
GPIO pads and RAM powered by the High Voltage Supply (VDD_PADS). The EM250 can be woken by configuring
the sleep timer to generate an interrupt after a period of time, using an external interrupt, or with the SIF
interface. Activity on a serial interface may also be configured to wake the EM250, though actual reception of
data is not re-enabled until the EM250 has finished waking up. Depending on the speed of the serial data, it is
possible to finish waking up in the middle of a byte. Care must be taken to reset the serial interface between
bytes and discard any garbage data before the rest. Another condition for wakeup is general activity on GPIO
pins. The GPIO activity monitoring is described in section 5.1.
When in DEEP SLEEP, the internal regulator is disabled and VREG_OUT is turned off. All GPIO output signals
are maintained in a frozen state. Additionally, the state of all registers in the powered-down low-voltage
domain of the EM250 is lost. Register settings for application peripherals should be preserved by the
application as desired. The operation of DEEP SLEEP is controlled by EmberZNet PRO APIs which automatically
preserve the state of necessary system peripherals. The internal XAP2b CPU registers are automatically saved
and restored to RAM by hardware when entering and leaving the DEEP SLEEP mode, allowing code execution to
continue from where it left off. The event that caused the wakeup and any additional events that occurred
while waking up are reported to the application via the EmberZNet PRO APIs. Upon waking from DEEP SLEEP,
the internal regulator is re-enabled.
120-0082-000V Rev 1.1
Page 26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EM250-RTR | 功能描述:IC ZIGBEE SYSTEM-ON-CHIP 48-QFN RoHS:是 类别:RF/IF 和 RFID >> RF 收发器 系列:EM250 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:30 系列:- 频率:4.9GHz ~ 5.9GHz 数据传输率 - 最大:54Mbps 调制或协议:* 应用:* 功率 - 输出:-3dBm 灵敏度:- 电源电压:2.7 V ~ 3.6 V 电流 - 接收:* 电流 - 传输:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 工作温度:-25°C ~ 85°C 封装/外壳:68-TQFN 裸露焊盘 包装:管件 |
| EM250-STACK-R | 制造商:Silicon Laboratories Inc 功能描述:EM250 BOARD STACK (RCM + BREAKOUT) - Boxed Product (Development Kits) 制造商:Silicon Laboratories Inc 功能描述:BOARD STACK EM250 RCM & BREAKOUT |
| EM25-12V-DC | 制造商:ECLIPSE MAGNETICS 功能描述:HOLDING ELECTRO MAGNET |
| EM2513N/11560 | 制造商:ebm-papst Inc 功能描述:- Bulk |
| EM2524N/11560 | 制造商:ebm-papst Inc 功能描述:- Bulk |
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