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33811 Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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33811 Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 18 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33811 FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION ANALOG VOLTAGE SUPPLY (VPWR) The VPWR pin is battery input to the 33811 IC. The VPWR pin requires external reverse battery and transient protection. Maximum input voltage on VPWR is 15.5V for full operation. All IC analog current is provided from the VPWR pin through an internal voltage regulator. The VPWR pin requires adequate decoupling capacitance to the A_GND pin. DIGITAL VOLTAGE SUPPLY (VDD) The VDD pin is Logic Supply input to the 33811 IC. Maximum input voltage on VDD is 5.25V for full operation. All IC digital logic current except the SPI SO output pin is provided from the VDD pin. The VDD pin requires adequate decoupling capacitance to the D_GND pin. SPI INTERFACE VOLTAGE (VSPI) The VSPI input pin is used to determine communication logic voltage levels between the microprocessor and the 33811 device. Current from VSPI is used to drive SO output and pull-up current for CS and SI. VSPI must be connected to +5 Volts or +3.3 Volts for normal operation. ANALOG GROUND (A_GND) The Analog Ground (A_GND) pin provides a low current analog ground for the IC. The VPWR supply is referenced to the A_GND pin. The A_GND pin should be used for decoupling the VPWR pin. DIGITAL GROUND (D_GND) The Digital Ground (D_GND) pin provides a dedicated ground for the VDD and VSPI supplies and should be connected to the A_GND pin. SERIAL CLOCK INPUT (SCLK) The system clock (SCLK) pin clocks the internal shift register of the 33811. The SI data is latched into the input shift register on the rising edge of SCLK signal. The SO pin shifts status bits out on the falling edge of SCLK. The SO data is available for the MCU to read on the rising edge of SCLK. With CS in a logic high state, signals on the SCLK and SI pins will be ignored and the SO pin is tri-state. CHIP SELECT (CS) The system MCU selects the 33811 to receive communication using the chip select (CS) pin. With the CS in a logic low state, command words may be sent to the 33811 via the serial input (SI) pin, and status information is received by the MCU via the serial output (SO) pin. The falling edge of CS enables the SO output and transfers status information into the SO buffer. Rising edge of the CS initiates the following operation: 1. Disables the SO driver (high-impedance) 2. Activates the received command word, allowing the 33811 to activate/deactivate output drivers. To avoid any spurious data, it is essential the high-to-low and low-to-high transitions of the CS signal occur only when SCLK is in a logic low state. Internal to the 33811 device is an active pull-up to VSPI on CS. In cases where voltage exists on CS without the application of VSPI, no current will flow from CS to the VSPI pin. SERIAL INPUT DATA (SI) The SI pin is used for serial instruction data input. SI information is latched into the input register on the rising edge of SCLK. A logic high state present on SI will program a one in the command word on the rising edge of the CS signal. To program a complete word, 16 bits of information must be entered into the device. SERIAL OUTPUT DATA (SO) The SO pin is the output from the shift register. The SO pin remains tri-stated until the CS pin transitions to a logic low state. All normal operating drivers are reported as zero, all faulted drivers are reported as one. The negative transition of CS enables the SO driver. The SI/SO shifting of the data follows a first-in-first-out protocol, with both input and output words transferring the most significant bit (MSB) first. RESET INPUT (RESET) The RESET pin is an active high digital input pin used to clear the fault outputs and registers in the device. During normal operation the RESET pin should be held low. SOLENOID MONITOR INPUT (SOLM1, SOLM2, SOLM3, SOLM4, SOLM5) These are the five solenoid monitor inputs that are connected to the Solenoid solenoid driver output pins. |
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