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Chroma74 Notes

DisplayData Chroma74 JM10201828B FCC ID: VC7120-0157 IC: 8910A - 1200157 61-74000200

https://fccid.io/VC7

Display

NOTE: The QR Code decodes to the the same as the first two lines

WF0750T80BF190E42U59S0 706697470-Y05J WUXI VISION PEAK TECHNOLOGY WFD0750BF19 JD

Board

DISPLAYDATA LTD 2016 EDK293 Issue 2 220-0083-02 EC243951

Exposed Pads
Pad Pin Chip Name Notes
TP2,TP12 31 CC RESET_N Reset Active Low (reset)
TP3,TP13 15 CC P2_1 D I/O Port 2.1, (debug)
TP4,TP14 VCC VCC VCC
TP5,TP15 16 CC P2_2 D I/O Port 2.2 (clock)
TP6,TP16 6 CC P0_1 D I/O Port 0.1
TP7,TP17 33 CC P1_6 D I/O Port 1.6
TP8,TP18 GND GND GND
TP9,TP19 32 P1_7 D I/O Port 1.7
TP10 E_INK
TP11 E_INK

CC1110Fx

Voltage Range: 2.0v - 3.6v

NOTE: All Digital I/O Test Pads are not connected to loads

Batteries

6x CR2450 3.2v - 1.8v 680mAh

Series Parallel 2x3 9.6v - 5.4v per string 2Ah

yes - these modern price tags are worth considering.  It is ... with me 
 recently a treaded run to (do not know if this is about the 
 dynamically increased price was angry customer) and curiosity got me 
 let's have a look.
 A dream for the purist - hardly a handful of components:
 six lithium button cells, according to the manufacturer with 2-3 accesses per day 
 a store from Macronix should last for five years
 MX25V8006EM1I-13G MX25U Series 3.6 V 8 Mb (8 M x 1/4 M x 2),
 e.paper-display from Wuxi Vision Peak Technology Corporation Limited with 
 around 7 "and probably 640 x 384 points and from Texas Instruments 
 Processor CC1110F32 Sub-1 GHz wireless MCU with up to 32 kB flash memory

 If I read correctly, the chip will send 315, 433, 868, or 
 915 MHz and also has USB on board.  - that gives space for ideas ...

 The manufacturer displaydata controls the parts via its own 
 Radio router, the labels should work bidirectionally and can 
 be several thousand in one system.

 greeting

Links

https://github.com/donnm/rfcat

https://hackaday.com/2019/02/25/e-ink-price-tags-fall-off-store-shelves-onto-your-workbench/

https://www.npmjs.com/package/subgrfspy

https://getrileylink.org/product-category/rileylink-parts

https://github.com/ecc1/cc111x

https://webthesis.biblio.polito.it/8459/1/tesi.pdf

https://www.jemrf.com/collections/rf-sensors/products/wireless-base-station-for-raspberry-pi

https://hackaday.io/project/175947-74-e-ink-shelf-label-used-as-a-weather-station/details

https://github.com/atc1441/E-Paper_Pricetags

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