1.3 VQFN-24 Pinout with I2C and SPI Interface

In the 24-pin VQFN package, there is access to both the I2C and SPI bus pins. Both can be used simultaneously. However, any concurrent transactions must be to different blocks in the device.

Pull-up resistors are required for proper operation of the I2C bus, sized according to the board configuration and bus speed required per the I2C specification.

Table 1-3. 24-Pin VQFN Pin Configuration
Pin Name Pin Number Function
VCC 1 2.7V-5.5V Power Supply
NC 2, 3, 4, 5, 6, 10, 13, 14, 15, 16, 17, 23 Not Internally Connected
CS 7 Chip Select for SPI
GPIO_1 8 General Purpose I/O pin
GPIO_2 9 General Purpose I/O pin
GPIO_3 11 General Purpose I/O pin
VSS 12 Ground
SDA 18 I2C Data
SCL 19 I2C Clock
SI 20 SPI Serial Data Input
SCK 21 SPI Clock
SO 22 SPI Serial Data Output
RESET 24 Reset Input, active low
Note: The exposed paddle is electrically isolated from the die. It is recommended that this be connected to GND.
Figure 1-3. Pinout