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Wiki > Main > FmTunerHardware
---+!! Overview of FM tuner chips

%TOC%

---++ Introduction

This page gives an overview of the various FM chips in current Rockbox targets and experimental Rockbox ports.

---+++ Philips/NXP TEA5700 family
This family of FM tuners is the most popular in rockbox targets.

---++++ TEA5760/TEA5761
Supported in rockbox by the tea5760uk.c driver.

These chips are used in:
   * TEA5760: [[MeizuM6Port][Meizu M6SL and M3]]
   * !TEA5761UK: CreativeZEN, [[CreativeZVMPort][Creative ZVM]] (30 and 60 GB models), [[IriverH10JrPort][iRiver H10 jr]],

---++++ TEA5767
Supported in rockbox by the tea5767.c driver.

These chips are used in:
   * TEA5767: [[CobyInfo][Coby]], CreativeZenV, [[IaudioU3Info][iAudio U3]], [[InsideMPIOHD200][MPIO HD200]], [[InsideMPIOHD300][MPIO HD300]], [[IriverE100Internals][iRiver E100]], [[IriverH10HardwareComponents][iRiver H10]], [[IriverHardwareComponents][iRiver H1xx]], [[IriverH3XXHardwareComponents][iRiver H3xx]], [[IriverIfp7XXHardwareComponents][iRiver IFP-7xx]], [[OndaVX747]], [[OndaVX767]], [[PhilipsGoGear3100Port][Philips GoGear 3100 series]], [[GoGearHDD6330][Philips GoGear HDD6330]], [[SamsungK5Port][Samsung K5]], SamsungYH920, [[SansaC100Port][Sansa C100]], [[SansaM200Port][Sansa M200]], [[SansaM200V4Port][Sansa M200v4]], [[CreativeZenTouch#Creative_Series_3_NJB3_Info][Zen Micro]]
   * !TEA5767HN: [[ArchosAv300Port][Archos Av300]], GoGearHDD6330 (HDD1630 and HDD6330)

---+++ Sanyo LV24000 family
General features: 
   * bus interface is a proprietary 3-wire protocol
   * tuning requires a multi-step algorithm with assistance of the host microcontroller
These chips are used in: 
   * LV24000: [[MeizuM6Port][Meizu M6 T1/TP, Meizu M6 SP]]
   * LV24020: [[CowonIaudio7Info][Cowon iAudio7]], [[SandiskE200HardwareComponents][Sansa e200]], [[SansaC200Port][Sansa C200]]
   * !LV24020LP: [[CowonD2Info][Cowon D2]]

---+++ Silicon Laboratories Si4700 family
General features: 
   * few external components (basically an antenna and a crystal).
   * bus interface is either a 2-wire !I2C-like protocol, or a 3-wire proprietary protocol
   * built-in firmware provides a high-level command interface (e.g. it can automatically seek forwards/backwards)
Some models of this chip provide RDS support (Si4701 and Si4703).

---++++ Si4700/Si4702
These chips are basic FM tuners, without RDS support. The Si4700 and Si4702 are supported by the rockbox si4700.c driver.

These chips are used in:
   * Si4700: IriverS10, [[IriverE10Info][iRiver E10]]
   * Si4702: SansaC200v2, SansaClip, [[SansaClip][SansaClipv2]], [[SansaClip][SansaClip+]], SansaE200v2, SansaFuze, [[SansaFuze][SansaFuzev2]], SansaView

---++++ Si4701/Si4703
These chips provide the same functionality as the Si4700/Si4702 but with RDS support added.

These chips are used in:
   * Si4701: [[GigabeatSPort][Gigabeat S]]
   * Si4703: SamsungYPS3, [[SansaClip][Sandisk Sansa Clip Zip]], [[SansaFuzePlus][Sansa Fuze+]]
---+++ RDA microelectronics RDA58xx family

Quite similar to the Si4700 chips (even the same !I2C address), but with a different register map.
---++++ RDA5802

This chip is used in some Sansa Clip+ players.

Writes start at register 0x02, read start at register 0x0A (similar to si4700). The first 16 registers are shown below.

|  Reg  | Name | D15 | D14 | D13 | D12 | D11 | D10 | D9 | D8 | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
| 00 | | | | | | | | | | | | | | | | | |
| 01 | | | | | | | | | | | | | | | | | |
| 02 |  POWERCFG  | | DMUTE | MONO | | | | | | | | | | | | | ENABLE |
| 03 |  CHANNEL  | CHAN |||||||||| |  TUNE  |  BAND  ||  SPACE  ||
| 04 | SYSCONFIG1 | | | | | DE | MUTE? | SMUTE | | | | | | | | | |
| 05 | SYSCONFIG2 | | | | | | | | | | | | |  VOLUME  ||||
| 06 | SYSCONFIG3 | | | | | | | | | | | | | | | | |
| 07 | | | | | | | | | | | | | | | | | |
| 08 | | | | | | | | | | | | | | | | | |
| 09 | | | | | | | | | | | | | | | | | |
| 0A |  READCHAN  | |  STC  | | | | |  READCHAN  ||||||||||
| 0B |  STATUSRSSI  |  RSSI  |||||| | AFCRL | | | | | | | | |
| 0C |  IDENT  | ID1 = 0x58 ||||||| | | | | | | | | |
| 0D | | ID2 = 0x00 or not ||||||| | | | | | | | | |
| 0E | | | | | | | | | | | | | | | | | |
| 0F | | | | | | | | | | | | | | | | | |

   * Radio chip detection: Read 128 bytes from the chip, check if bytes[4] == 0x58. If this is the case, the chip has been detected. Now write 2 bytes (0x200) and wait a bit (10 ms), then check bytes[6] and compare against 0. If 0, write a set of 72 initialisation values, else write a set of 82 initialisation values.
   * Mute radio: Set or clear the DMUTE bit, just like the si4700. Also set bits 9 and 10 of register 0x04 and the four lowest bits of register 5 (VOLUME).
   * Force mono: Set or clear the MONO bit, just like the si4700.
   * Set band: Write the 2-bit band code in BAND, similar to the si4700, but in a different location.The lowest bit of BAND indicates the start of the band as follows: 0 = 76 MHz, 1 = 87 MHz
   * Power down: Write either 0 (powerdown) or 1 (powerup) to register 0x02. Set register bits 9 and 10 of register 0x04.
   * Set soft-mute: On un-mute, clear bit 9 of register 0x04. On mute, set bits 9 and 10 of register 0x04.
   * Set de-emphasis: Set or clear bit 11 of register 0x04, just like the si4700.
   * Set channel spacing: Write the 2-bit channel space code in SPACE, similar to si4700, but in a different location.
   * Set frequency: Calculate the channel code CHAN = (Fdesired - Flow) / 50 KHz, where Fdesired is the frequency to tune to and Flow is the lowest frequency in this band. Then write CHAN together with the TUNE bit set. Wait 70 ms, read 4 bytes status. Verify that READCHAN = CHAN and that STC is set, if so we're done, otherwise clear TUNE and try the whole procedure again up to 25 times.
   * Read RSSI: Read 4 bytes from the radio chip. If AFCRL is set, assume 0, otherwise return RSSI bits.
---+++ Samsung !S1A0903X01
Supported in rockbox by the s1a0903x01.c driver

Used in:
   * Archos FM recorder

---+++ Niigata family
There is no driver yet for this family of FM tuners in rockbox.

General features:
   * bus interface is a 2-wire !I2C protocol, or a 3-wire protocol
   * [[http://www.westpactech.com/pro_niigata_ns953m.html][Product information page]]
These chips are used in: 
   * !NS953M: SamsungYPT7
---+++STFM1000
There is no driver yet for this tuner in rockbox.

This tuner is controlled over !I2C and appears to use a digital audio output (most other tuners output an analog stereo signal).
It also supports RDS, but it appears that this requires a lot of attention from software to decode.

These chips are used in:
   * Creative Zen X-FI 2 and 3
r22 - 19 Mar 2012 - 21:49:14 - BertrikSikken