DS1650 Datasheet, PDF (6/26 Pages) National Semiconductor (TI) – Quad Differential Line Receivers

RT1650
Operation
MCU Based Digital Circuit
RT1650 is a SoC (System on Chip) produce, which
contains system level feature to control the
communication with power transmitter, power
calculation and GPIO. The firmware can be
programmed into OTP (One Time Programmable)
memory, so that user can discuss the features with
RICHTEK, and custom some functions and GPIO
behavior. To flexibly control whole functions, this chip
embedded a MTP (Multiple Time Programmable)
memory to save various setting and parameters. The
external host can real-time read some power
information via I²C interface.
OVP (Over Voltage Protection)
The OVP function using to protect the abnormal power
signal to let the RT1650 damaged. Once the VRECT
exceeds 11.5V, this block will drive the CLAMP MOS to
avoid the over voltage damage.
OTP (Over Temperature Protection)
The OTP function shuts down the linear regulator
operation when the junction temperature exceeds
150C. Once the junction temperature cools down by
around 20C, the receiver will automatically resume
operating.
Synchronous Rectifier Control
This block detect the zero-cross of the AC1 and AC2
voltage then control the high-side and low-side MOS of
the rectifier. RT1650 provide the Asynchronous,
Half-synchronous and Full-synchronous control to
optimize the rectifier efficiency.
Mode Control
Mode control is using for the default mode, wireless
mode, adapter mode and disable mode selection.
Adapter Detection
In the default mode and adapter mode, adapter
detection block control the ADEN pin to follow the
VADD-5V to avoid the PMOS damaged.
FSK Decoder
This block analysis the frequency from the AC1 and
AC2. This information can use for the FSK (Frequency
Shift Key) decode to the WPC medium power standard.
This information also can use for the power loss
calculation of the resonant tank.
Packet Control
This block build up the WPC standard 2kHz bi-phase
encoding scheme with the asynchronous serial format
and the packet structure. This block control the
open-drain MOS to achieve the ASK (Amplitude Shift
Key) communication.
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DS1650-00 July 2015