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MAX7360EWX+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX7360EWX+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 31 page  I2C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection ______________________________________________________________________________________ 11 GPOs. The settings in this register are ignored for ports not configured as GPOs, and a read from this register returns the values stored in the register (see Table 11 in the Register Tables section). Autorepeat Register (0x05) The MAX7360 autorepeat feature notifies the host that at least one key has been pressed for a continuous period. The autorepeat register enables or disables this feature, sets the time delay after the last key event before the key repeat code (0x7E) is entered into the FIFO, and sets the frequency at which the key-repeat code is entered into the FIFO thereafter. Bit D7 specifies whether the autorepeat function is enabled with 0 denoting autorepeat disabled, and 1 denoting autorepeat enabled. Bits D0– D3 specify the autorepeat delay in terms of debounce cycles ranging from 8–128 debounce cycles (see Table 12 in the Register Tables section). Bits D4, D5, and D6 specify the autorepeat rate or frequency ranging from 4–32 debounce cycles. When autorepeat is enabled, holding the key pressed results in a key-repeat event that is denoted by 0x7E. The key being pressed does not show up again in the FIFO. Only one autorepeat code is entered into the FIFO, regardless of the number of keys pressed. The autorepeat code continues to be entered in the FIFO at the frequency set by bits D4–D1 until another key event is recorded. Following the key-release event, if any keys are still pressed, the MAX7360 restarts the autorepeat sequence. Autosleep Register (0x06) Autosleep puts the MAX7360 in sleep mode to draw minimal current. When enabled, the MAX7360 enters sleep mode if no keys are pressed for the autosleep time (see Table 13 in the Register Tables section). Key-Switch Sleep Mode In sleep mode, the MAX7360 draws minimal current. Switch-matrix current sources are turned off and pulled up to VCC. When autosleep is enabled, key-switch inactivity for a period longer than the autosleep time puts the part into sleep mode (FIFO data is maintained). Writing a 1 to D7, or a keypress, can take the MAX7360 out of sleep mode. Bit D7 in the configuration register gives the sleep-mode status and can be read any time. The FIFO data is maintained while in sleep mode. Autowake Keypresses initiate autowake and the MAX7360 goes into operating mode. Keypresses that autowake the MAX7360 are not lost. When a key is pressed while the MAX7360 is in sleep mode, all analog circuitry, including switch- matrix current sources, turn on in 2ms. The initial key needs to be pressed for 2ms plus the debounce time to be stored in the FIFO. Write a 0 to D1 in the configuration register (0x01) to disable autowakeup. GPIOs The MAX7360 has eight GPIO ports with LED control functions. The ports can be used as logic inputs, logic outputs, or constant-current PWM LED drivers. In addition, PORT7 and PORT8 can function as a rotary switch input pair. When in PWM mode, the ports are set up to start their PWM cycle in 45N phase increments. This prevents large current spikes on the LED supply voltage when driving multiple LEDs. GPIO Global Configuration Register (0x40) The GPIO global configuration register controls the main settings for the eight GPIOs (see Table 14 in the Register Tables section). Bit D7 enables PORT[7:6] as inputs for a rotary switch. Bit D5 enables interrupt generation for I2C timeouts. D4 is the main enable/shutdown bit for the GPIOs. D3 functions as a software reset for the GPIO registers (0x40 to 0x5F). Bits D[2:0] set the fade in/out time for the GPIOs configured as constant-current sinks. GPIO Control Register (0x41) The GPIO control register configures each port as either an input or an output (see Table 15 in the Register Tables section). All GPIOs allow individual configurations, and power up as inputs. Enabling rotary switch mode automatically sets D7 and D6 as inputs. The ports consume additional current if their inputs are left undriven. GPIO Debounce Configuration Register (0x42) The GPIO debounce configuration register sets the amount of time a GPIO must be held for the MAX7360 to register a logic transition (see Table 16 in the Register Tables section). The GPIO debounce setting is independent of the key-switch debounce setting. Five bits (D[4:0]) set 32 possible debounce times from 9ms up to 40ms. |
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