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MAX7316 Просмотр технического описания (PDF) - Maxim Integrated

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MAX7316 Datasheet PDF : 24 Pages
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10-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
Table 5. Ports Configuration Register
REGISTER
Ports configuration
(1 = input, 0 = output)
Read back ports configuration
ADDRESS
R/W CODE
REGISTER DATA
(HEX)
D7
D6
D5
D4
D3
D2
D1
D0
0
0x06
OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0
1
Table 6. Input Ports Register
REGISTER
Read input ports
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
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 register
Blink phase 0 register
Blink phase 1 register
Blink phase 1 register
Blink phase 0 register
The MAX7316 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 MAX7316
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).
Each output’s individual 4-bit intensity control only
operates during the number of timeslots gated by the
master intensity. The individual controls provide 16
intensity settings from 1/16 through 16/16 (Table 14).
Figures 16, 17, and 18 show examples of individual
intensity control settings. The highest value an individ-
ual or global setting can be set to is 16/16. This setting
forces the output to ignore the master control, and fol-
low the logic level set by the appropriate blink phase
register bit. The output becomes a glitch-free static out-
put with no PWM.
Using PWM Intensity Controls with Blink Disabled
When blink is disabled (Table 7), the blink phase 0 reg-
ister specifies each output’s logic level during the PWM
on-time (Table 8). The effect of setting an output’s blink
phase 0 register bit to 0 or 1 is shown in Table 11. With
its output bit set to zero, an LED can be controlled with
16 intensity settings from 1/16th duty through fully on,
but cannot be turned fully off using the PWM intensity
control. With its output bit set to 1, an LED can be con-
trolled with 16 intensity settings from fully off through
15/16th duty.
______________________________________________________________________________________ 15

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