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JN5169 Datasheet(PDF) 58 Page - NXP Semiconductors |
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JN5169 Datasheet(HTML) 58 Page - NXP Semiconductors |
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58 / 95 page  JN5169 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2017. All rights reserved. Product data sheet Rev. 1.3 — 22 September 2017 58 of 95 NXP Semiconductors JN5169 IEEE802.15.4 Wireless Microcontroller When entering into sleep mode, there is an option to retain the RAM contents throughout the sleep period. If the wake-up timers are not to be used for a wake-up event and the application does not require them to run continually, power can be saved by switching off the 32 kHz oscillator if selected as the 32 kHz system clock through software control. The oscillator will be restarted when a wake-up event occurs. While in sleep mode, one of four possible events can cause a wake-up to occur: transitions on DIO inputs, expiry of wake-up timers, pulse counters maturing or comparator events. If any of these events occur and the relevant interrupt is enabled, an interrupt is generated that will cause a wake-up from sleep. It is possible for multiple wake-up sources to trigger an event at the same instant but only one of them will be accountable for the wake-up period. It is therefore necessary in software to remove all other pending wake-up events prior to requesting entry back into sleep mode; otherwise, the device will reawaken immediately. When wake-up occurs, a similar sequence of events to the reset process described in Section 9.4 happens, including the checking of the supply voltage by the Supply Voltage Monitor (Section 9.4.4). The high-speed RC oscillator is started up and, once stable, the power to CPU system is enabled and the reset is removed. Software determines that this is a reset from sleep and so commences with the wake-up process. If RAM contents were held through sleep, wake-up is quicker as the software does not have to initialize RAM contents meaning the application can recommence more quickly. See Section 14.3.5 for wake-up timings. 10.3.1 Wake-up timer event The JN5169 contains two 41-bit wake-up timers that are counters clocked from the 32 kHz oscillator, and can be programmed to generate a wake-up event. Following a wake-up event, the timers continue to run. These timers are described in Section 9.9.8. Timer events can be generated from both timers; one is intended for use by the IEEE802.15.4 protocol, the other being available for use by the application running on the CPU. These timers are available to run at any time, even during sleep mode. 10.3.2 DIO event Any DIO pin when used as an input has the capability, by detecting a transition, to generate a wake-up event. Once this feature has been enabled, the type of transition can be specified (rising or falling edge). Even when groups of DIO lines are configured for alternative functions, such as the UARTs or timers, any input line in the group can still be used to provide a wake-up event. This means that an external device communicating over the UART can wake up a sleeping device by asserting its RTS signal pin (which is the CTS input of the JN5169). 10.3.3 Comparator event The comparator can generate a wake-up interrupt when a change in the relative levels of the positive and negative inputs occurs. The ability to wake up when continuously monitoring analog signals is useful in ultra-low power applications. For example, the JN5169 can remain in sleep mode until the voltage drops below a threshold and then be woken up to deal with the alarm condition; the comparator has a low current mode to facilitate this. |
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