AS3900 datasheet(6/59 Pages) AMSCO

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AS3900

Data Sheet - Pin Assignm ent

VSS_OTP

Negative OTP Supply Voltage. Ground reference for VDD_OTP. Decouple

point for buffer capacitors of VDD_OTP.

Not connected. Leave the pin floating.

SDATAI

Serial Digital Interface DATA input. Serial Data Input for writing registers. The

bits are clocked in on the falling edge of SCLK.

SCLK

Serial Digital Interface Clock. A serial clock provides the SCLK for accessing

data from the AS3900. Write and read operation is provided by the SCLK.

SEN

Serial Digital Interface Enable. CMOS digital input. Falling edges on SEN

ends a read or write operation and frames the serial data transfer.

SDATAO

Serial Digital Interface DATA output. Serial Data Output for reading registers.

The bits are clocked out on the rising edge of SCLK and can be read from the

microcontroller on the falling edge of SCLK.

MCU_CLK

Microcontroller Clock Output. Programmable Clock for microcontroller that is

derived from the 27MHz crystal oscillator. System frequency for microcontroller

can be adjusted between 188kHz and 3.39MHz.

IRQ

Interrupt Output. Digital CMOS Output for external interrupt input at

microcontroller. If an interrupt condition is met a HIGH level is applied on the

IRQ pin. The IRQ level is set to low level after the internal interrupt registers are

read manually. An interrupt can be triggered on the rising edge of the IRQ pin.

Not connected. Leave the pin floating.

X27_OUT

27MHz oscillator output. Analog output for 27.12MHz crystal oscillator.

X27_IN

27MHz oscillator input. Analog input for 27.12MHz crystal oscillator

VDD

Positive Digital Supply Voltage. 2.2V to 3.6V. Decoupling capacitors (1µF,

100nF and 100pF) are recommended.

GND

Negative Digital Supply Voltage. Ground reference point for VDD. Decouple

point for capacitors.

X32_OUT

32kHz oscillator output. Analog output for 32.768kHz crystal oscillator.

X32_IN

32kHz oscillator input. Analog input for 32.768kHz crystal oscillator

VDDRF

Positive RF Supply Voltage. 2.2V to 3.6V. Decoupling capacitors (1µF, 100nF

and 100pF) are recommended.

Table 1. QFN 28 pin Package

Pin Name

Pin Number

Pin Type

Description

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