Rainbow-electronics MAX13362 Bedienungsanleitung PDF herunterladen (Seite 10)

MAX13362

Serial Peripheral Interface

(

, SDO, SDI, CLK)

The MAX13362 operates as a serial peripheral interface

(SPI) slave device. An SPI master accesses and pro-

grams the MAX13362 by reading/writing the control

registers. The control registers are 32 bits wide, have 2

command bits (or register addresses) and 30 data bits

(see Table 1). Figure 3 shows the read/write sequence

through SPI. The SPI logic counts the number of bits

clocked into the IC (using a modulo-32 counter so that

daisy chaining is possible) and enables data latching

only if exactly 32 bits (or an integer multiple thereof)

have been clocked in.

Status Register

The status register contains the status of the switches

connected to IN0–IN23. The status register also con-

tains an overtemperature warning bit, a power-on-reset

bit and a device type bit (see Table 1). The status reg-

ister is accessed by the SPI-compatible interface.

24-Channel Automotive Switch Monitor

10 ______________________________________________________________________________________

Figure 3. SPI Read/Write Sequence

CLK

SDI

SDO

D12CB0 CB1 D0

RSTDTZ

D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11

T S0 S8S7S6S5S4S3S2S1 S9 S10

D24D13 D14 D15 D16 D17 D18 D19 D20 D21 D22 D23 D29D25 D26 D27 D28

ZS11 S12 S13 S14 S15 S16 S17 S18

S19

S20 S21 S22 S23 x x xx x

NOTE: X = UNUSED, Z = HIGH IMPEDANCE.

BIT NAME BIT DESCRIPTION

CB0, CB1 Command bits. Select the internal register to which data bits D0–D29 are to be written.

D0–D29 Data bits.

S0–S23 Switch state bit. 0 = switch open, 1 = switch closed.

T Overtemperature bit. When overtemperature occurs, this bit is set to 1. It is reset on the rising edge of CS.

RST

Power-on-reset bit. It indicates whether the IC has had a power-on-reset since the last SPI read. 0 = device has

been reset. RST is set to 1 on the rising edge of CS.

DT Device type. 0 = reserved for future use, 1 = MAX13362.

Table 1. Bit Description

1 2 ... 5 6 7 8 9 10 11 12 13 14

MAX13362 1

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