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CY8C3446LTI-085 Datasheet(PDF) 5 Page - Cypress Semiconductor |
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CY8C3446LTI-085 Datasheet(HTML) 5 Page - Cypress Semiconductor |
5 / 130 page PSoC® 3: CY8C34 Family Datasheet Document Number: 001-53304 Rev. *Q Page 5 of 130 The device provides a PLL to generate clock frequencies up to 50 MHz from the IMO, external crystal, or external reference clock. It also contains a separate, very low-power Internal low-speed oscillator (ILO) for the sleep and watchdog timers. A 32.768-kHz external watch crystal is also supported for use in RTC applications. The clocks, together with programmable clock dividers, provide the flexibility to integrate most timing requirements. The CY8C34 family supports a wide supply operating range from 1.71 V to 5.5 V. This allows operation from regulated supplies such as 1.8 V ± 5 percent, 2.5 V ±10 percent, 3.3 V ± 10 percent, or 5.0 V ± 10 percent, or directly from a wide range of battery types. In addition, it provides an integrated high efficiency synchronous boost converter that can power the device from supply voltages as low as 0.5 V. This enables the device to be powered directly from a single battery or solar cell. In addition, you can use the boost converter to generate other voltages required by the device, such as a 3.3-V supply for LCD glass drive. The boost’s output is available on the VBOOST pin, allowing other devices in the application to be powered from the PSoC. PSoC supports a wide range of low-power modes. These include a 200-nA hibernate mode with RAM retention and a 1-µA sleep mode with RTC. In the second mode the optional 32.768-kHz watch crystal runs continuously and maintains an accurate RTC. Power to all major functional blocks, including the programmable digital and analog peripherals, can be controlled independently by firmware. This allows low-power background processing when some peripherals are not in use. This, in turn, provides a total device current of only 1.2 mA when the CPU is running at 6 MHz, or 0.8 mA running at 3 MHz. The details of the PSoC power modes are covered in the “Power System” section on page 29 of this data sheet. PSoC uses JTAG (4-wire) or SWD (2-wire) interfaces for programming, debug, and test. The 1-wire SWV may also be used for ‘printf’ style debugging. By combining SWD and SWV, you can implement a full debugging interface with just three pins. Using these standard interfaces enables you to debug or program the PSoC with a variety of hardware solutions from Cypress or third party vendors. PSoC supports on-chip break points and 4 KB instruction and data race memory for debug. Details of the programming, test, and debugging interfaces are discussed in the “Programming, Debug Interfaces, Resources” section on page 61 of this data sheet. 2. Pinouts Each VDDIO pin powers a specific set of I/O pins. (The USBIOs are powered from VDDD.) Using the VDDIO pins, a single PSoC can support multiple voltage levels, reducing the need for off-chip level shifters. The black lines drawn on the pinout diagrams in Figure 2-3 through Figure 2-6 show the pins that are powered by each VDDIO. Each VDDIO may source up to 100 mA total to its associated I/O pins, as shown in Figure 2-1. Figure 2-1. VDDIO Current Limit Conversely, for the 100-pin and 68-pin devices, the set of I/O pins associated with any VDDIO may sink up to 100 mA total, as shown in Figure 2-2. Figure 2-2. I/O Pins Current Limit For the 48-pin devices, the set of I/O pins associated with VDDIO0 plus VDDIO2 may sink up to 100 mA total. The set of I/O pins associated with VDDIO1 plus VDDIO3 may sink up to a total of 100 mA. PSoC VDDIO X IDDIO X = 100 mA I/O Pins PSoC VDDIO X Ipins = 100 mA I/O Pins VSSD |
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