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MAX7314ATG

18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection

Maxim Integrated 

18-Port GPIO with LED Intensity Control,

Interrupt, and Hot-Insertion Protection

Table 5. Ports Configuration Registers

REGISTER

ADDRESS

R/W CODE

REGISTER DATA

(hex)

D7

D6

D5

D4

D3

D2

D1

D0

Ports configuration P7–P0

(1 = input, 0 = output)

0

0x06

OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0

Read back ports configuration P7–P0

1

Ports configuration P15–P8

(1 = input, 0 = output)

0

0x07 OP15 OP14 OP13 OP12 OP11 OP10 OP9 OP8

Read back ports configuration P15–P8 1

Table 6. Input Ports Registers

REGISTER

Read input ports P7–P0

Read input ports P15–P8

ADDRESS

R/W CODE

REGISTER DATA

(hex)

D7

D6

D5

D4

D3

D2

D1

D0

1

0x00

IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0

1

0x01

IP15 IP14 IP13 IP12 IP11 IP10 IP9 IP8

Table 7. Blink Logic

BLINK ENABLE

FLAG E

BLINK FLIP

FLAG B

0

X

0

0

1

1

1

BLINK INPUT

PIN

X

0

1

0

1

BLINK FLIP FLAG

EXOR

BLINK FUNCTION

BLINK INPUT PIN

X

Disabled

0

1

Enabled

1

0

OUTPUT REGISTERS USED

Blink phase 0 registers

Blink phase 0 registers

Blink phase 1 registers

Blink phase 1 registers

Blink phase 0 registers

Reading a blink phase register reads the value stored

in the register, not the actual port condition. The port

output itself may or may not be at a valid logic level,

depending on the external load connected.

The 17th output, O16, is controlled through 2 bits in the

configuration register, which provide the same static or

blink control as the other 16 output ports.

PWM Intensity Control

The MAX7314 includes an internal oscillator, nominally

32kHz, to generate PWM timing for LED intensity con-

trol or other applications such as PWM trim DACs.

PWM can be disabled entirely for all the outputs. In this

case, all outputs are static and the MAX7314 operating

current is lowest because the internal PWM oscillator is

turned off.

The MAX7314 can be configured to provide any combi-

nation of PWM outputs and glitch-free logic outputs.

Each PWM output has an individual 4-bit intensity con-

trol (Table 14). When all outputs are to be used with the

same PWM setting, the outputs can be controlled

together instead using the global intensity control

(Table 13). Table 10 shows how to set up the MAX7314

to suit a particular application.

PWM Timing

The PWM control uses a 240-step PWM period, divided

into 15 master intensity timeslots. Each master intensity

timeslot is divided further into 16 PWM cycles (Figure 12).

The master intensity operates as a gate, allowing the indi-

vidual output settings to be enabled from 1 to 15 timeslots

per PWM period (Figures 13, 14, 15) (Table 13).

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