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Page: Chroma 74H
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1.3” EL013H2WRD Peghook 1.54″ HS‐154R‐N 13.3″ EL133C2WRN 2.1″ Chroma‐21 2.2″ BWRY EL022F6W4A 2.2″ EL022H3WRA 2.6″ BWRY Newton Pro EL026F6W4A 2.7″ ST‐GR27000 2.9″ Chroma 29 2.9″ EL029D2WRA SubGHz 2.9″ EL029GSWRN 2.9″ EL029H3WRA 2.9″ ST‐GM29MT1 2.9″ TG‐GM29MT1C ST‐GM29MTF 4.2″ Chroma 42 4.2″ ST‐GR42 4.2″ TG‐GR42 4inch AP 7.4″ ST GM7500N 7.5″ ST‐GR750BN 88MZ100 Changelog 88MZ100 Programming and interfacing Access point pinouts Adding an SD card BLE only AP Beginners Guide for an easy to build Access Point (aka spaghetti AP) Binary file nomenclature Build AP firmware CC1310 Based Chroma Tags Chroma 74 Chroma 74H Chroma Aeon 74 Chroma Series SubGhz Tags Content cards Default settings for new Tags ESP32‐PoE‐ISO_AP Firmware Updates Flashing SiLabs based M3 Newton Displays Generic CC1101 modules for SubGhz Google Apps Scripts Home ICS calendar Installing SubGhz Beta Led control LilyGo T‐Panel AP Lithium Ion replacement for CR2450 M2 NFC 2.9″ and 1.54″ M2 Tag Firmware changelog M3 Tag Firmware changelog Nano AP V2 Opticon 2.1″ BWRY EE‐214RY Opticon 2.9″ BWRY EE‐293RY Opticon 4.2″ BWR EE‐420R Opticon 7.5″ BWR EE‐750R Opticon CC2533‐based tags Picture Frame for 7.4" Price tags RF protocol Restoring Lost Serial Numbers in Chroma Tags SubGhz AP Configuration SubGhz support for the LilyGo T‐Panel Tag protocol timing Troubleshooting usage Uploading & Using Custom Fonts, with examples Using your own fork with OTA updates Yellow AP with EByte CC1101 module rf‐wake tagtype notes
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Chroma 74H
Skip Hansen edited this page 2025-12-12 06:35:35 -08:00
Table of Contents

Chroma 74 H+

The display is 6.4 x 3.90 inch BWR or BWY with a resolution 800 x 480.

The SPI flash chip is the 1024K byte MX25V8006E.

The flash is organized as 256 4k sectors or 16 65k blocks. Sectors, blocks, or the entire chip can be erased at a time.

Unlike the other Chroma tags this tag uses an ARM Cortex M3 based CC1310F64 controller rather than the (much) older CC1110.

The FCC ID is VC7120-0226

See CC1310 Based Chroma Tags for more information.

Board Revisions

SN Rev
(Last character)		 Board Rev EPD Controller EPD Panel Notes
"C" edk511 Issue 1
220-00000907-01
2021		 ? 60105-00372
V03 0129

EPD display

The EPD used on the Chroma74H+ is very similar to the Waveshare 800x480 3-color display used on the Aeon Chroma74 HOWEVER it doesn't seem to support the partial window opcodes 0x91 and 0x92.
If these opcodes are avoided the display works with the same code as the Aeon Chroma74.