MAX16068 datasheet(25/40 Pages) MAXIM

Part #	MAX16068

Description	6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

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Manufacturer	MAXIM [Maxim Integrated Products]

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______________________________________________________________________________________ 25

6-Channel, Flash-Configurable System Manager

with Nonvolatile Fault Registers

Acknowledge

The acknowledge bit (ACK) is the 9th bit attached to

any 8-bit data word. The receiving device always gener-

ates an ACK. The MAX16068 generates an ACK when

receiving an address or data by pulling SDA low during

the 9th clock period (Figure 8). When transmitting data,

such as when the master device reads data back from

the MAX16068, the device waits for the master device to

generate an ACK. Monitoring ACK allows for detection

of unsuccessful data transfers. An unsuccessful data

transfer occurs if the receiving device is busy or if a sys-

tem fault has occurred. In the event of an unsuccessful

data transfer, the bus master can reattempt communica-

tion at a later time. The MAX16068 generates a NACK

after the command byte received during a software

reboot, while writing to the flash, or when receiving an

illegal memory address.

Slave Address

Use the slave address input, A0, to allow multiple identi-

cal devices to share the same serial bus. Connect A0 to

GND, DBP (or an external supply voltage greater than

2V), SCL, or SDA to set the device address on the bus.

See Table 18 for a listing of all possible 7-bit addresses.

The slave address can also be set to a custom value by

loading the address into register r8Bh[6:0]. See Table

19. If r8Bh[6:0] is loaded with 00h, the address is set by

input A0. Do not set the address to 09h or 7Fh to avoid

address conflicts. The slave address setting takes effect

immediately after writing to the register.

Figure 8. Acknowledge

Table 18. Setting the SMBus Slave Address

R = Read/write select bit.

SCL

1

S

2

8

9

SDA BY

TRANSMITTER

SDA BY

RECEIVER

CLOCK PULSE FOR ACKNOWLEDGE

NACK

ACK

SLAVE ADDRESSES

A0

SLAVE ADDRESS

0

1010 100R

1

1010 101R

SCL

1010 110R

SDA

1010 111R

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