Pin Description for EEPROM Memory
Pin Name
Type
Description
VDDP
¾
External Positive power supply for EEPROM Memory
VSSP
¾
External Negative power supply for EEPROM Memory, ground
SDA
I/O
Internal Serial data input/output signal
Internal connected with MCU I/O line.
SCL
I
Serial clock input signal
Internal connected with MCU I/O line.
NC
¾
Implies that the pin is
²
Not Connected
²
and can therefore not be used.
Note:
The pin descriptions for all external pins with the exception of the EEPROM VDDP and VSSP pins are
described in the preceding MCU section.
VDDP and VSSP should be externally connected to the MCU power supply named VDD and VSS respectively.
The SDA and SCL lines here are internal connected to the MCU I/O pins PC0 and PC1 respectively for these
devices.
Pin Description for RF Transceiver
Pin Name
Type
Description
RF_P
I/O
External Differential RF input/output (+)
RF_N
I/O
External Differential RF input/output (-)
VDD_RF1
I
External RF transceiver power supply
(1)
VDD_RF2
I
External RF transceiver power supply
(1)
GPIO0
GPIO1
I/O
External General Purpose digital I/O
It is also used as an external TX/RX switch control
GPIO2
I/O
External General Purpose digital I/O
It is also used as an external Power Amplifier (P.A.) enable control.
VDD_D
I
External RF transceiver digital circuit power supply (+)
GND_D
I
External RF transceiver digital circuit power supply (-)
VDD_2V2
O
External RF transceiver DC-DC output voltage
It cannot be used.
VDD_3V
I
External RF transceiver 3V input for a DC-DC regulator
GND_GR
¾
External RF transceiver Guard-Ring ground
VDD_A
I
External RF transceiver power supply for analog circuits
(1)
XTAL_P
I
External RF transceiver 32MHz Crystal input (+)
XTAL_N
I
External RF transceiver 32MHz Crystal input (-)
VDD_PLL
I
External RF transceiver PLL power supply
(1)
VDD_CP
I
External RF transceiver Charge pump power supply
(1)
VDD_VCO
I
External RF transceiver Voltage-controlled oscillator power supply
(1)
LOOP_C
I/O
External RF transceiver PLL loop filter external capacitor
It is connected to the external 47pF capacitor.
VDD_GR
I
External RF transceiver Guard-Ring power supply
(1)
VDD_BG
O
External RF transceiver Bandgap power supply
(1)
DB4
I
External Test pin
It is connected to ground.
DB5
I
External Test pin
It is connected to ground.
HT82M75REW/HT82K75REW
Rev. 1.00
4
June 11, 2010
electronic components distributor