PSM example program seems to consume high current in nRF9160 DK.

Question

I'm measuring the current consumption of udp_with_psm program reading this post, and the current is very high. why? 
 https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/measuring-psm-idle-current-on-the-nrf91-dk?CommentId=f9c4d469-0bfe-48f6-9ad5-118da9078a60 
 Modified points compared to the udp_with_psm in the above post 
 - Modem FW: v1.0.0 
 - NCS tag: v1.0.0 
 - Use a LTE-M SIM which is not iBasis one. eDRX and PSM seems to work with the SIM. 
 - fixed code error:
	freeaddrinfo(res); // THIS IS REQUIRED
	printk("Finished
");
	(void)close(client_fd);
}
 
 - change PSM setting <prj.conf>

# 1 minute interval
CONFIG_LTE_PSM_REQ_RPTAU="10100001"

# 6 sec for idle
CONFIG_LTE_PSM_REQ_RAT="00000011" 
 - change host and port // UDP test
#define HOST "8.8.8.8"
#define PORT 53 
 With this program, the floor current is 29 uA. Also the DK seems to generates a high current spike every 1.28 sec. 
 Why a current spike is generated every 1.28 sec? 
 The message is sent in the configured interval, 1 min.

Øyvind · Accepted Answer

Hello, 
 Use a LTE-M SIM which is not iBasis one. eDRX and PSM seems to work with the SIM. 
 Have you confirmed this with the vendor? The 29µA can indicate that the SIM card does not turn off. Can you please try to eject the SIM card during measurement to confirm? This should usually not be done in a normal scenario as it can cause issues with the network. 
 - fixed code 
 Thanks for pointing this out. This has been fixed in the Git repo: https://github.com/Rallare/fw-nrfconnect-nrf/tree/nrf9160_samples/samples/nrf9160/udp_with_psm I have notified the author of the tutorial to fix this. 
 Kind regards, Øyvind

PSM example program seems to consume high current in nRF9160 DK.

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