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71M6534 Datasheet(PDF) 42 Page - Maxim Integrated Products |
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71M6534 Datasheet(HTML) 42 Page - Maxim Integrated Products |
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42 / 132 page  71M6533/G/H and 71M6534/H Data Sheet FDS_6533_6534_004 42 Rev 2 1.5.6 Optical Interface The device includes an interface to implement an IR/optical port. The pin OPT_TX is designed to directly drive an external LED for transmitting data on an optical link. The pin OPT_RX has the same threshold as the RX pin, but can also be used to sense the input from an external photo detector used as the receiver for the optical link. OPT_TX and OPT_RX are connected to a dedicated UART port (UART1). The OPT_TX and OPT_RX pins can be inverted with configuration bits OPT_TXINV and OPT_RXINV, respectively. Additionally, the OPT_TX output may be modulated at 38 kHz. Modulation is available when system power is present (i.e. not in BROWNOUT mode). The OPT_TXMOD bit enables modulation. The duty cycle is controlled by OPT_FDC[1:0], which can select 50%, 25%, 12.5%, and 6.25% duty cycle. A 6.25% duty cycle means OPT_TX is low for 6.25% of the period. Figure 8 illustrates the OPT_TX generator. B A OPT_TXMOD = 0 OPT_TXMOD = 1, OPT_FDC = 2 (25%) B A 1/38kHz OPT_TXINV from OPT_TX UART MOD EN DUTY OPT_TX OPT_TXMOD OPT_FDC OPT_TXE[1:0] 1 2 V3P3 Internal A B 0 2 3 DIO2 WPULSE VARPULSE Figure 8: Optical Interface When not needed for the optical UART, the OPT_TX pin can alternatively be configured as DIO2, WPULSE, or VARPULSE. The configuration bits are OPT_TXE[1:0]. Likewise, OPT_RX can alternately be configured as DIO_1. Its control is OPT_RXDIS. In the 71M6534, a multiplexer allows the selection of alternate pins DIO18/MTX and DIO22/RTX for UART1. This function is controlled with the UMUX_E and UMUX_SEL bits in I/O RAM. 1.5.7 Digital I/O The device includes up to 40 pins (71M6533) or 53 pins (71M6534) of general purpose digital I/O. These pins are compatible with 5 V inputs (no current limiting resistors are needed). The Digital I/O pins can be categorized as follows: • Dedicated DIO pins (5 pins): DIO3, DIO56, DIO57, DIO58, PB • DIO/LCD segment pins o A total of 33 pins for the 71M6533: DIO4/SEG24 - DIO11/SEG31 (8 pins) DIO13/SEG33 - DIO21/SEG41 (9 pins) DIO23/SEG43 – DIO27/SEG47 (5 pins) DIO29/SEG49 - DIO30/SEG50 (2 pins) DIO41/SEG61 (1 pin) DIO43/SEG63 - DIO45/SEG65 (3 pins) DIO47/SEG67 – DIO51/SEG71 (5 pins) o A total of 46 pins for the 71M6534: DIO4/SEG24 – DIO30/SEG50 (27 pins) DIO36/SEG56 – DIO39/SEG59 (4 pins) DIO41/SEG61 – DIO55/SEG75 (15 pins) • DIO pins combined with other functions (2 pins): DIO2/OPT_TX, DIO1/OPT_RX |
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