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AS3900

Data Sheet - Detail ed Description

8.4.5 Read Received Data

After successfully receive of the data the interrupt line is set.

The microcontroller reads the interrupt register (with this read the IRQ line is reset).

The microcontroller reads the ADDRESS (ID) to which sensor the data belongs.

The microcontroller reads the DATALEN register.

With this read the received DATA is transferred to the SDI output register and clocked out by means of the SDI Clock (SCLK).

8.4.6 Interrupt Interface Description

If an interrupt condition is met a HIGH level is applied to the IRQ pin. The IRQ level is set to LOW level after reading the Interrupt registers.

The microcontroller than reads the interrupt register to distinguish between different interrupt sources. The interrupt sources could be enabled or

disabled by the use of the Interrupt Mask Registers. The Interrupt Mask Register defines which interrupt leads to a LOW to HIGH transition of the

IRQ line.

Figure 19. Interrupt Operation

CLEAR_TIMER_5

100101

Deactivate timing system 5

CLEAR_TIMER_6

100110

Deactivate timing system 6

CLEAR_TIMER_7

100111

Deactivate timing system 7

CLEAR_TIMER_ALL

101000

Deactivate all timing systems

Table 16. Interrupt Electrical Interface Description

Name

Signal

Signal Level

Description

IRQ

Digital Output

CMOS

Interrupt Output pin (max Load = 10pF)

Table 15. Direct Commands

Command Name

MODE Pattern (com. bits)

MODE Description

C5

C4

C3

C2

C1

C0

Enable Interrupts

REG 0x2C, 0x2D

Read Interrupts

REG0x2A, 0x2B

Interrupt

Link Manager

IRQ