Rainbow-electronics MAX6965 Manual do Utilizador descarregar pdf (Página 8)

MAX6965

during the high period of the clock pulse. When the

master is transmitting to the MAX6965, the device gen-

erates the acknowledge bit because the MAX6965 is

the recipient. When the MAX6965 is transmitting to the

master, the master generates the acknowledge bit

because the master is the recipient.

Slave Address

The MAX6965 has a 7-bit long slave address (Figure 6).

The eighth bit following the 7-bit slave address is the

R/W bit. The R/W bit is low for a write command, high

for a read command.

The second (A5), third (A4), fourth (A3), sixth (A1), and

last (A0) bits of the MAX6965 slave address are always

1, 0, 0, 0, and 0. Slave address bits A6 and A2 are

selected by the address input AD0. AD0 can be con-

nected to GND, V+, SDA, or SCL. The MAX6965 has

four possible slave addresses (Table 1), and therefore

a maximum of four MAX6965 devices can be controlled

independently from the same interface.

Message Format for Writing the MAX6965

A write to the MAX6965 comprises the transmission of

the MAX6965’s slave address with the R/W bit set to

zero, followed by at least 1 byte of information. The first

byte of information is the command byte. The command

byte determines which register of the MAX6965 is to be

written to by the next byte, if received (Table 2). If a

STOP condition is detected after the command byte is

received, then the MAX6965 takes no further action

beyond storing the command byte.

Any bytes received after the command byte are data

bytes. The first data byte goes into the internal register of

the MAX6965 selected by the command byte (Figure 8).

If multiple data bytes are transmitted before a STOP con-

dition is detected, these bytes are generally stored in

subsequent MAX6965 internal registers because the

command byte address autoincrements (Table 2). A

diagram of a write to the output ports registers (blink

phase 0 register or blink phase 1 register) is given in

Figure 10.

9-Output LED Driver with Intensity Control

8 _______________________________________________________________________________________

Table 1. MAX6965 I

C Slave Address Map

DEVICE ADDRESS

PIN AD0

A6 A5 A4 A3 A2 A1 A0

SCL1100000

SDA1100100

GND0100000

V+0100100

Table 2. Register Address Map

ADDRESS CODE

(hex)

AUTOINCREMENT

ADDRESS

Blink phase 0 outputs 0x01 0x01 (no change)

User RAM 0x03 0x03 (no change)

Blink phase 1 outputs 0x09 0x09 (no change)

Master, O8 intensity 0x0E 0x0E (no change)

Configuration 0x0F 0x0F (no change)

Outputs intensity O1, O0 0x10 0x11

Outputs intensity O3, O2 0x11 0x12

Outputs intensity O5, O4 0x12 0x13

Outputs intensity O7, O6 0x13 0x10

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 22 23

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