User's Guide
Table Of Contents
- Contents
- Revision history
- Introduction
- Kit content
- Getting started
- Firmware
- Firmware update
- Hardware description
- Regulatory notices
- Glossary
- DK (Development Kit)
- GPIO
- Global Positioning System (GPS)
- Integrated Development Environment (IDE)
- MCUboot
- Near Field Communication (NFC)
- Personal Unblocking Key (PUK)
- Software Development Kit (SDK)
- SEGGER Embedded Studio (SES)
- Subscriber Identity Module (SIM)
- System in Package (SiP)
- System on Chip (SoC)
- User Equipment (UE)
- Universal Integrated Circuit Card (UICC)
- Universal Serial Bus (USB)
- Acronyms and abbreviations
- Legal notices
Hardware description
Figure 30: Schematics for battery connector, and the power switch
6.10.1 PMIC
Nordic Thingy:91 uses a power management IC (PMIC) as internal power management. The PMIC includes
a battery charger, a fuel gauge and two regulator outputs.
The PMIC has three voltage domain outputs that are used on Nordic Thingy:91:
• VSYS used for the nRF9160 SiP
• One 1.8 V output used as GPIO voltage
• One 3.3 V output used for analog circuitry
The 1.8 V domain supplies the nRF52840, the accelerometers, the environment sensors, and the GPIOs of
the nRF9160. This domain must always be on for Nordic Thingy:91 to work.
The 3.3 V domain supplies the LEDs, the color sensor, the buzzer, the RF switches and the GPS LNA. This
power domain can be powered down to save power when Nordic Thingy:91 is in sleep mode.
Figure 31: PMIC schematic
6.10.2 Current measurement
It is possible to measure the current flowing to nRF9160 and nRF52840 by cutting the short on SB3
(nRF9160) and/or SB4 (nRF52840) and placing an ampere meter between the terminals of P1 (nRF9160)
and terminals of P2 (nRF52840).
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