Catfish hardware

The catfish hardware is based on the Qualcomm MSM8909w chipset. In the picture of the front of the main board with the shield removed, this part is just above the horizontal center line of the board and slightly to the left of the vertical center line. The large part under the bit of rubber or glue is a Kingston 04EPOP04-NL3DM627, which is a combo memory of 4GB MLC + 4Gb LPDDR3 in a 136-Ball BGA package.

NOTE: The unit GB is gigabytes while the unit Gb is gigabits. This terminology comes directly from the manufacturer (see: an archived web page)

Front of catfish main board with shield removed

Back of catfish main board

STM32F412REY (package WLCSP) on front of catfish main board

Hardware details - front

Outside the shield at the top left of the board is a STM32F412REY (package WLCSP). Markings on that chip are:

F412REY6
A5 008 VQ
TW 8 16 C

A picture of this chip is shown below. Voltage detector XC6114 from Torex, providing 2.1V detection, is a much smaller chip to the right side of the board. Markings on that chip are:

848
2605
A7NZ

Voltage detector XC6114 from Torex. 2.1V detection.

Hardware details - back

Unknown chips 3 and 4 on back of catfish

At the top of the board below the two connectors are two chips, shown in a picture below as "unknown chips 3 and 4 on back of catfish." Chip 3 is probably a Class‑K speaker amplifier (from Awinic AW87318CSR). The markings on the chip to the left say:

 2310208
 VGM41_1
 B8214

The markings on the on the right say:

K318
AFC3

Toward the bottom of the board are three additional chips. To the left of the battery connector is a chip labeled:

SF
739

With a barcode between "SF" and "739". A closeup photo is shown below as unknown chip #5. This SF739 chip may be the secure element paired to the NFC chip (perhaps a ST33J2M0 family as they are designed to work together).

Unknown chip #5 labeled SF739. May be the secure element paired to the NFC chip (perhaps a ST33J2M0 family as they are designed to work together).

Chip labeled 75CK871, a single-cell Li-ion gauge from Texas Instruments BQ27421YZFR-G1D.

The chip labeled 75CK871 is a single-cell Li-ion gauge from Texas Instruments BQ27421YZFR-G1D and is to the right of the battery connector and bears these markings:

75CK371
BQ27431
G1D

In the photo below, it's the smaller chip to the left.

ST71NFCD Near Field Communications (NFC) controller

The chip to the right of at the bottom, the largest chip on the back of the board, is a ST71NFCD which is a Near field communication (NFC) controller which includes its own ARM Cortex-M3 microcontroller. A closeup photo of that chip is also shown below.