Rainbow-electronics MAX1364 Bedienungsanleitung PDF herunterladen (Seite 13)

unsuccessful data transfers. An unsuccessful data trans-

fer happens if a receiving device is busy or if a system

fault has occurred. In the event of an unsuccessful data

transfer, the bus master reattempts communication at a

later time.

Slave Address

The MAX1363/MAX1364 have a 7-bit I

C slave

address. The slave address is selected using A0. The

MAX1363/MAX1364 (EUB, MEUB, and LEUB) have

three base address options, allowing up to six devices

concurrently per I

C bus (see Table 1).

The MAX1363/MAX1364 continuously wait for a START

condition followed by its slave address. When the device

recognizes its slave address, it is ready to accept or

send data depending on the R/W bit (Figure 6).

HS I

C Mode

At power-up, the MAX1363/MAX1364 bus timing is set

for fast mode (F/S mode, up to 400kHz I

C clock), which

limits the conversion rate to approximately 22ksps.

Switch to high-speed mode (HS mode, up to 1.7MHz

C clock) to achieve conversion rates up to 94.4ksps.

The MAX1363/MAX1364 convert up to 133ksps in moni-

tor mode, regardless of I

C mode. If conversion results

are unread, I

C bandwidth limitations do not apply (see

the Monitor Mode section).

Select HS mode by addressing all devices on the bus

with the HS-mode master code 0000 1XXX (X = don’t

care). After successfully receiving the HS-mode master

code, the MAX1363/MAX1364 issue a NACK, allowing

SDA to be pulled high for one clock cycle (Figure 7).

After the NACK, the MAX1363/MAX1364 operate in HS

mode. Send a repeated START (Sr) followed by a slave

address to initiate HS-mode communication. If the mas-

ter generates a STOP condition, the MAX1363/

MAX1364 return to F/S mode. Use a repeated START

condition (Sr) in place of a STOP condition to leave the

bus active and the mode unchanged.

MAX1363/MAX1364

4-Channel, 12-Bit System Monitors with Programmable

Trip Window and SMBus Alert Response

______________________________________________________________________________________ 13

011 1000R/W ACK

SLAVE ADDRESS

SCL

SDA

123456789

Figure 6. MAX1363/MAX1364 Slave Address Byte

A0 STATE SUFFIX ADDRESS

Low EUB 0110100

High EUB 0110101

Low LEUB 0110010

High LEUB 0110011

Low MEUB 0110110

High MEUB 0110111

Table 1. I

C Slave Selection Table

000 10XXXNACK

HS-MODE MASTER CODE

SCL

SDA

S Sr

F/S MODE HS MODE

Figure 7. F/S-Mode to HS-Mode Transfer

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

MAX1363/MAX1364 1

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