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MT3333 View Datasheet(PDF) - MediaTek Inc

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MT3333 All-in-One GNSS
Datasheet
5.11.3. Inter-Integrated Circuit (I2C)
Note: I2C support is available in firmware on request.
I2C support in MT3333 offers multi-master and slave modes. The multi-master mode supports 7-bit and 10-bit
address modes up to 400 Kb/s fast mode and 3.4 Mb/s high-speed mode. In addition, MT3333 supports a manual
or automatic indicator for data transfer in the slave mode. Device addresses in the slave mode are programmable
and support fast mode and high-speed mode data transmission and reception.
5.12. Interrupt control unit
The interrupt control unit manages all internal and external sources of interrupts, which include timer, watch-dog,
all interfaces (UART, I2C and SPI) and external user interrupt pins. These interrupt sources can be used as wake-up
events when the chipset is in low power mode.
5.13. Flash
External SPI serial flash of up to 128 Mb is supported. A MediaTek Flash tool is provided for downloading firmware
into the 8Mb internal flash.
5.14. General-Purpose Input/Output (GPIO) unit
MT3333 supports a variety of peripherals through up to 16 programmable GPIO ports. The number of available
GPIO ports will depend on which serial interface is in use. The unit manages all GPIO lines and supports a simple
control interface. GPIO provides signal or message outputs.
5.15. Pulse Per Second (PPS) output
The PPS signal can be provided through the designated output pin for external applications. In addition to its limit
of being active every second it’s possible to set up the duration, frequency and active high/low by programming
user-defined settings.
5.16. External Clock (ECLK) pin
An external clock signal can be applied to MT3333 using the ECLK pin and is used to obtain the relation between
the external clock and GPS local clock.
With precise external clock input, the clock drift of the GPS local clock can be correctly estimated. Using this
information, the Doppler search range is narrowed down. This technology is beneficial because it speeds up the
satellite acquisition process. Particularly in the cold start case, due to limited prior information about the satellites’
location and local clock uncertainty, a receiver will execute a search across the full frequency range. Consequently,
a longer acquisition time can be expected. However, the ECLK technology is able to reduce the frequency
uncertainty so that the search process will be completed in a shorter time. Efficient acquisition and lower power
consumption are achieved with ECLK technology.
5.17. SYNC
SYNC is a timestamp signal input pin for introducing external timing information to the GPS receiver. It’s used to
obtain the relationship between the external timing and the GPS receiver local timing, from which the GPS time of
week (TOW) can be correctly estimated.
This technology is beneficial for time to first fix (TTFF), particularly in weak signal environments. In hot start, with
prior information about the GPS receiver’s location and satellite ephemeris data, the GPS receiver uses the correct
© 2016 - 2017 MediaTek Inc.
Page 10 of 22
This document contains information that is proprietary to MediaTek Inc. (“MediaTek”) and/or its licensor(s).
Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.
 

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