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CY8C4014LQI-SLT2 Datasheet(PDF) 6 Page - Cypress Semiconductor |
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CY8C4014LQI-SLT2 Datasheet(HTML) 6 Page - Cypress Semiconductor |
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6 / 34 page  PSoC® 4: PSoC 4000 Family Datasheet Document Number: 001-89638 Rev. *E Page 6 of 34 Analog Blocks Low-power Comparators The PSoC 4000 has a low-power comparator, which uses the built-in voltage reference. Any one of up to 16 pins can be used as a comparator input and the output of the comparator can be brought out to a pin. The selected comparator input is connected to the minus input of the comparator with the plus input always connected to the 1.2-V voltage reference. This comparator is also used for CapSense purposes and is not available during CapSense operation. Current DACs The PSoC 4000 has two IDACs, which can drive any of up to 16 pins on the chip. These IDACs have programmable current ranges. Analog Multiplexed Buses The PSoC 4000 has two concentric independent buses that go around the periphery of the chip. These buses (called amux buses) are connected to firmware-programmable analog switches that allow the chip's internal resources (IDACs, comparator) to connect to any pin on Ports 0, 1, and 2. Fixed Function Digital Timer/Counter/PWM (TCPWM) Block The TCPWM block consists of a 16-bit counter with user-programmable period length. There is a capture register to record the count value at the time of an event (which may be an I/O event), a period register that is used to either stop or auto-reload the counter when its count is equal to the period register, and compare registers to generate compare value signals that are used as PWM duty cycle outputs. The block also provides true and complementary outputs with programmable offset between them to allow use as dead-band programmable complementary PWM outputs. It also has a Kill input to force outputs to a predetermined state; for example, this is used in motor drive systems when an over-current state is indicated and the PWM driving the FETs needs to be shut off immediately with no time for software intervention. Serial Communication Block (SCB) The PSoC 4000 has a serial communication block, which imple- ments a multi-master I2C interface. I2C Mode : The hardware I2C block implements a full multi-master and slave interface (it is capable of multi-master arbitration). This block is capable of operating at speeds of up to 400 kbps (Fast Mode) and has flexible buffering options to reduce interrupt overhead and latency for the CPU. It also supports EZI2C that creates a mailbox address range in the memory of the PSoC 4000 and effectively reduces I2C commu- nication to reading from and writing to an array in memory. In addition, the block supports an 8-deep FIFO for receive and transmit which, by increasing the time given for the CPU to read data, greatly reduces the need for clock stretching caused by the CPU not having read data on time. The I2C peripheral is compatible with the I2C Standard-mode and Fast-mode devices as defined in the NXP I2C-bus specification and user manual (UM10204). The I2C bus I/O is implemented with GPIO in open-drain modes. The PSoC 4000 is not completely compliant with the I2C spec in the following respect: ■ GPIO cells are not overvoltage tolerant and, therefore, cannot be hot-swapped or powered up independently of the rest of the I2C system. ■ Fast-mode minimum fall time is not met in Fast Strong mode; Slow Strong mode can help meet this spec depending on the Bus Load. GPIO The PSoC 4000 has up to 20 GPIOs. The GPIO block imple- ments the following: ■ Eight drive modes: ❐ Analog input mode (input and output buffers disabled) ❐ Input only ❐ Weak pull-up with strong pull-down ❐ Strong pull-up with weak pull-down ❐ Open drain with strong pull-down ❐ Open drain with strong pull-up ❐ Strong pull-up with strong pull-down ❐ Weak pull-up with weak pull-down ■ Input threshold select (CMOS or LVTTL). ■ Individual control of input and output buffer enabling/disabling in addition to the drive strength modes ■ Selectable slew rates for dV/dt related noise control to improve EMI The pins are organized in logical entities called ports, which are 8-bit in width (less for Ports 2 and 3). During power-on and reset, the blocks are forced to the disable state so as not to crowbar any inputs and/or cause excess turn-on current. A multiplexing network known as a high-speed I/O matrix is used to multiplex between various signals that may connect to an I/O pin. Data output and pin state registers store, respectively, the values to be driven on the pins and the states of the pins themselves. Every I/O pin can generate an interrupt if so enabled and each I/O port has an interrupt request (IRQ) and interrupt service routine (ISR) vector associated with it (4 for PSoC 4000). The 28-pin and 24-pin packages have 20 GPIOs. The 16-pin SOIC has 13 GPIOs. The 16-pin QFN and the 16-ball WLCSP have 12 GPIOs. The 8-pin SOIC has 5 GPIOs. Special Function Peripherals CapSense CapSense is supported in the PSoC 4000 through a CSD block that can be connected to up to 16 pins through an analog mux bus via an analog switch (pins on Port 3 are not available for CapSense purposes). CapSense function can thus be provided on any available pin or group of pins in a system under software control. A PSoC Creator component is provided for the CapSense block to make it easy for the user. Shield voltage can be driven on another mux bus to provide water-tolerance capability. Water tolerance is provided by driving the shield electrode in phase with the sense electrode to keep the shield capacitance from attenuating the sensed input. Proximity sensing can also be implemented. The CapSense block has two IDACs, which can be used for general purposes if CapSense is not being used (both IDACs are available in that case) or if CapSense is used without water tolerance (one IDAC is available). |
Similar Part No. - CY8C4014LQI-SLT2 |
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Similar Description - CY8C4014LQI-SLT2 |
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