DS1650 Datasheet, PDF (20/26 Pages) National Semiconductor (TI) – Quad Differential Line Receivers

RT1650
I²C Interface
The RT1650 provides I²C interface to communicate
with external host device. Besides OTP firmware
programming and MTP setting programming can be
approached through the I²C interface, the external host
can also communicate with the RT1650 to achieve
more flexible applications. For example, the host can
read the ADC information via the I²C Interface. In
addition, the I²C is used to read the internal status and
the power source is from the VRECT. If the wireless
function disable or in the adapter mode, the I²C can’t
be accessed. Table 3 shows the register definition. It’s
not fixed, the registers definition can be costumed by
firmware. If user need to read other information via I²C,
please discuss with RICHTEK firmware engineer.
I²C Slave
0100010X (in binary format)
0x44 / 0x45 (hex format, include R/W bit)
MSB
LSB
0 1 0 0 0 1 0 R/W
Address
0x64
0x66
0x67
0x78
0x79
0x7A
0x7B
0x7B
0x10
0x02
0x03
MSB
7
7
7
7
7
7
6
7
7
7
5
0x7C
3
Table 3. RT1650 Register Definition
LSB
Name
Description
0
Vrect
Vrect (4V to 8V), unit = 15.68mV
0
Vout
Vout (3V to 6V), unit = 11.76mV
0
Iout
Iout (0A to 2A), unit = 7.84mA
0
last CE packet
last CE packet
0
last RP packet
last RP packet
0
Received Power [7:0] (mW)
low byte of Received Power (mW)
0
Received Power [14:8] (mW)
high byte of Received Power (mW)
7
Received Power updating flag
0: Received Power is valid
1: Received Power is updating, not valid
7
Vout enable
0: Vout is disable
1: Vout is enable
0
freq_cnt[7:0]
0
freq_cnt[13:8]
Frequency = 1000 / ((freq_cnt[13:0] *
0.11) /128) KHz
0
WPC phase status
WPC status
0:booting
1: ping phase
2: ID_CF phase
3: Negotiation phase
4: power transfer phase
GPIO Interface
The RT1650 provides a programmable General
Purpose Input/Output (GPIO) pin. The GPIO can be
used as an input or used as a status indicator for
different application. Before use this GPIO, user should
discuss its functions with RICHTEK and then RICHTEK
code its function into firmware.
GPIO can be programmed as an output port, be a
status indicator. For example,
 To control LED flashing when Rx position search
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 To indicate thermal regulation is active
 To indicate battery is full or charging is complete
GPIO can be programmed as input port, to connect
external signal and inform MCU. For example,
 Enable/Disable the output
 Enable the End Power Packet
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DS1650-00 July 2015