Hardware specs

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1. Internal overview of standard s1mp3back to top

Main Layer of pcb board Second layer of PCB board

2. The electric schematicback to top

Jan Folkers has made a reliable schematics from his player. [electric schems H85-09FC.7z]

PDF doc with the electric schematics(for the standard s1mp3): [Samograj_atj2085.pdf].

If you have another electric schematic for any s1mp3 player, please email me : wladston @at@ s1mp3.org

3. Board ID: device real identificationback to top

Board Number Location

An important thing about the player is the Board ID code. This is the only trustworthy identification of the device.

The code is written in white on the green board. It's located usually behind a plastic sticker, near the minus battery pole. If you need help to open the player, see a tutorial here: Dissassemble the s1mp3.

If you are having problems to find your board ID, it may be behind the LCD cable. You might have to lift it carefully to see the bard ID. Seek everywhere! Both sides of all the boards! Some people take a bit of time to find the small white words. We qualify anything printed in white on the green printboard as the board ID.

Example :


4. Actions ATJ2085[CPU][RAM][ROM]back to top

The ATJ2085 is an audio "system on chip". Inside, we have a Z80 processor, 29KB of ROM and 116KB of SRAM. And a "24-bit Harvard architecture DSP". They both have on-chip DSU.

Public links related to ATJ2085:

Here is the correct pin enumeration I made for the ATJ2085:

pin numberation for atj2085

We already got some additional information about the ATJ2085, if you need to know more, contact us at the mail list.

5. Nand Flash memory(Samsung or Hynix)back to top

It's the NAND flash memory chip, generally a Samsung or a Hynix chip.

You can find out the real size of your SAMSUNG chip here:

  • K9x1Gxxxxx = 1Gb (GigaBit) = 128MB (MegaByte)
  • K9x2Gxxxxx = 2Gb (GigaBit) = 256MB (MegaByte)
  • K9x4Gxxxxx = 4Gb (GigaBit) = 512MB (MegaByte)
  • K9x8Gxxxxx = 8Gb (GigaBit) = 1024MB (MegaByte)
  • K9xAGxxxxx = 2x K9K8G08U0M = 16Gb (GigaBit) = 2048MB (MegaByte)
  • (1 Byte = 8 bits)

You can find out the real size of your HYNIX chip here:

  • HY27UH081G2M = 1Gb (GigaBit) = 128MB (MegaByte)
  • HY27UH082G2M = 2Gb (GigaBit) = 256MB (MegaByte)
  • HY27UH084G2M = 4Gb (GigaBit) = 512MB (MegaByte)
  • HY27UH088G2M = 8Gb (GigaBit) = 1024MB (MegaByte)
  • (1 Byte = 8 bits)

You can find out the exact specification of your memory chip in these docs:

The complete datasheets:

6. Philips TEA5767[FM RADIO]back to top

Philips radio ci photo

The TEA5767 is a low power FM radio IC.

7. The LCD boardback to top

The LCD board is composed of a button and an LCD screen (and a few transistors/resistors). It's connected to the main board though a 20 pin cable. On some players, the lcd board may also host a NAND flash memory chip too.

Image of pcb board

8. The ICE header back to top

ICE detail on PCB

Little information is available. It is a 5-pin header, connected directly to the ICERST#, ICEEN#, GPO_A0, GPO_A2 and GPO_A3 legs at the ATJ2085. These last tree work as ICEDI, ICEDO and ICECK.

If you think you can help us to make ICE work, please contact us at the mail list.

9. Hardware capabilitiesback to top

  • 24 bits DSP with on-chip DSU
  • 8-bit Z80 CPU core with on-chip DSU (run at 24.576MHz(TYP), up to 60MHz - software controlled)
  • USB 1.1 - Although most of sellers say it support USB 2.0, they mean the device is "compliant" with this protocol, not a full speed mode capable device.
  • Support transfer speed up to 8Mbit/s, or 1MB/s
  • Works as a generic USB storage disk
  • Supports MPEG1/2/2.5 Audio Layer 1, 2, 3 and WMA. (We are not sure if other music formats are possible)
  • Frequency response : 20Hz to 20KHz [wasn't tested yet]
  • Earphone impedance: 32 ohm [wasn't tested yet]
  • Output power: 5mW x 5mW (16 ohm), can be 10mW x 10mW [wasn't tested yet]
  • S/N (noise ratio) 90dB [wasn't tested yet]
  • Record and play voice (but no mp3 encoding, for the most of s1mp3 players)
  • FM radio (depends on the presence of the philips radio chip)
  • Support live equalizer
  • Record with mic on WAV(32kbit), .ACT(8kbit) or .VOR(32 or 8kbit ) mode.

The s1 mp3 factory firmware can support up to a music player, a voice recorder, an internal files player, fm radio, a system config menu , a phone book* and a TXT file reader*

Factory firmware limitations:

  • 130 files/folder on root limitation
  • 99 musics per folder limitation
  • No ID3 lyrics support
  • Does not support random through all folders
  • Does not support playlists
  • Does not support selecting songs by ID3 filters
  • No sub directory support
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