93C46WP PDF Datasheet – 3-Wire Serial EEPROM (Memory)

This is one of the EEPROM types.

Part Number: 93C46WP

Function: 3-Wire Serial EEPROM

Package: SOP 8 Pin Type

Manufacturer: FMD, ST


93C46WP pdf datasheet

User Selectable Internal Organization:

0. 93C46WP: 1Kbit

1. FT93C46: 128 x 8 or 64 x 16

2. FT93C56: 256 x 8 or 128 x 16

3. FT93C66: 512 x 8 or 256 x 16


93C46WP is 1Kbit, MICROWIRE Serial Access EEPROM. These electrically erasable programmable memory (EEPROM) devices are accessed through a Serial Data Input (D) and Serial Data Output (Q)
using the MICROWIRE bus protocol.

The FT93C46/56/66 series are 1024/2048/4096 bits of serial Electrical Erasable and Programmable Read Only Memory, commonly known as EEPROM. They are organized as 64/128/256 words of 16 bits each when the ORG pin is connected to VCC (or unconnected) and 128/256/512 words of 8 bits (1 byte) each when the ORG pin is tied to ground. The devices are fabricated with proprietary advanced CMOS process for low power and low voltage applications. These devices are available in standard 8-lead PDIP, 8-lead JEDEC SOIC and 8-lead TSSOP packages. Our extended VCC range (1.8V to 5.5V) devices enables wide spectrum of applications.

Marking Informations:

93C46WP memory


1. 2 MHz Clock Rate (5V) Compatibility.

2. Industry Standard 3-wire Serial Interface.

3. Self-Timed ERASE/WRITE Cycles (5ms max including auto-erase).

4. Automatic ERAL before WRAL.

5. Sequential READ Function.

6.  High Reliability: Typical 1 Million Erase/Write Cycle Endurance.

93C46WP Datasheet

93C46WP pdf



CH340 Datasheet – USB to Serial Chip (CH340G)

Part Number: CH340

Function: USB to serial chip

Package: SSOP-20 Type

Manufacturer: WCH ( http://wch.cn/ )

This post explains for the semiconductor CH340.

Image :



CH340 is a USB bus convert chip and it can realize USB convert to serial interface, USB convert to IrDA infrared or USB convert to printer interface. In serial interface mode, CH340 supplies common MODEM liaison signal, used to enlarge asynchronous serial interface of computer or upgrade the common serial device to USBbus directly. More detail about USB convert to printer interface please referring to the second manual CH340DS2. In infrared mode, add infrared transceiver to CH340 can compose USB infrared adapter, realize SIR nfrared communication. The CH340 chip can be used with a variety of programming languages, including C, C++, Python, and others.


CH340 Pinout




1. Full speed USB device interface, conforms to USB Specification Version 2.0, only needs crystal and capacitance external.

2. Emulate standard serial interface, used to upgrade the former peripheral device, or add excess serial interface through USB.

3. Totally compatible with serial application program in computer endpoint Windows operation system.

4. Hardware full duplex serial interface, set transceiver buffer, supports communication baud rate varies from 50bps to 2Mbps.

5. Supports common MODEM liaison signal RTS, DTR, DCD, RI, DSR and CTS.

6. Through adding level converter equipment to supply RS232, RS485, RS422 and other interface.

7. Supports IrDA criterion SIR infrared communication, supports baud rate varies from 2400bps to

8. For it is through USB converts to serial interface, only compatible with application layer not totally.

9. Software compatible with CH341, using drive of CH341 directly.

10. Support 5V and 3.3V source voltage.


Block Diagram



Function description

CH340 sets up USB pull-up resistor internal, UD+ and UD- must be connected to USB bus.
CH340 set power up reset circuit. RSTI is used to input asynchronous reset signal from outside.

When RSTI is high-level, CH340 chip is reset. When RSTI is low-level, CH340 will continue delay 20mS to reset and then step into normal work state. In order to reset credibly during power up period and weaken the disturber from outside, a 0.47uF capacitance between RSTI and VCC is recommended.

When CH340 chip is working normally, the outside must supply 12MHz clock signal to XI pin.
In generally, clock signal is generated by inverter in CH340 through oscillating of crystal keeping frequency. A crystal of 12MHz between XI and XO, XI and XO connect a high frequency oscillator capacitance to ground respectively can compose the peripheral circuit.


Reference Site: https://www.sunrom.com/m/4511

Other data sheets are available within the file: CH340G, CH340R, CH340T

CH340 Datasheet

CH340 pdf



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