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Power Sequencer & I/O Expander for Printers (PPC/MFP)

Overview

In high-performance printers, such as plain paper copiers (PPC) and multi-function printers (MFP), various functions are controlled by an ASIC and/or MPU. This design adds a dedicated MCU to enhance functionality and optimize the system. The MCU provides power supply sequencing to reduce system standby current and support rapid startup. Additionally, the MCU serves as an I/O expander, reducing the number of pins required on the ASIC and MPU, thereby optimizing the total system cost.

System Benefits:

  • The sequencing function controls the power supply of each block and device, reducing system standby current and enabling rapid startup.
  • Total device cost is optimized by reducing the number of ASIC and MPU pins and utilizing a high pin-count MCU as an I/O expander.
  • This design is ideal not only for printers but also for ASIC and MPU-equipped systems that require extensive I/O.

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Template 1 Connector Arrow.1184 Connector Arrow.1181 Connector Arrow.1182 Connector Arrow.1183 Connector Line.131 Connector Arrow.1129 Bi-directional.1135 Connector Arrow.1108 Connector Line.1200 Connector Line.1201 Connector Arrow Connector Arrow.1161 Connector Arrow.1157 Bi-directional.1164 Bi-directional.1167 DC/DC DC/DC DC/DC 5V 5V 5V PMIC PMIC PMIC ASIC ASIC ASIC Connector 2 Connector Arrow.1016 Connector Arrow.1024 Connector Line Connector 1.1027 Connector 1.1028 Connector 1.1029 PCIe PCIe PCIe MPU MPU* MPU* User Interface User Interface User Interface Scanner Scanner Scanner Printer Printer Printer Communication Communication Communication Others Others Others Vertical Wire Bundle Label Text 10pt.1046 n n Sheet.52 Bi-directional Bi-directional.1133 Bi-directional.1134 WDT WDT WDT Bi-directional.1142 Bi-directional.1143 Bi-directional.1152 Bi-directional.1156 Vertical Wire Bundle.1158 Label Text 10pt.1046 n n Sheet.79 Bi-directional.1163 Bi-directional.1166 Vertical Wire Bundle.1171 Label Text 10pt.1046 n n Sheet.90 Bi-directional.1174 Connector Line.1186 Connector Arrow.1188 Connector Line.1189 Connector Arrow.1190 Connector Line.1192 Connector Line.1196 Connector Arrow.1197 Connector Line.1203 Connector Line.1205 Connector Arrow.1207 Sheet.119 For Complete Power and Clock Tree Refer to High-Performance V... For Complete Power and Clock Tree Refer to High-Performance Vision AI System 3.3V 3.3V 3.3V Sheet.122 *RZ/V2H MPU is shown as an example. Other MPUs (RZ/G, RZ/A) c... *RZ/V2H MPU is shown as an example. Other MPUs (RZ/G, RZ/A) can be used for this design. Connector Arrow.129 Vertical Wire Bundle.1168 Label Text 10pt.1046 n n Sheet.134 Connector Arrow.137 DC/DC Component block.751 Component block.747 Component block.748 DC/DC DC/DC DC/DC DC/DC Component block.751 Component block.747 Component block.748 DC/DC DC/DC DC/DC Connector Arrow.165 Connector Arrow.1025 Connector Arrow.164 Vertical Wire Bundle.1136 Label Text 10pt.1046 n n Sheet.168 Connector Arrow.183 Vertical Wire Bundle.171 Label Text 10pt.1046 n n Sheet.190 Sheet.191 JP257 JP257 JP257 Vertical Wire Bundle.193 Label Text 10pt.1046 n n Sheet.195 Vertical Wire Bundle.196 Label Text 10pt.1046 n n Sheet.198 Vertical Wire Bundle.199 Label Text 10pt.1046 n n Sheet.201 WDT WDT WDT Bi-directional.1199 Connector Arrow.1206 Connector Arrow.1123 Sheet.202 MCU SPI SPI SPI GPIO GPIO GPIO UART UART UART I/O Expander I/O Expander I/OExpander SPI SPI SPI GPIO (Sequencer) GPIO (Sequencer) GPIO(Sequencer) UART UART UART PWM PWM PWM GPIO GPIO GPIO PWM PWM PWM IRQ IRQ IRQ IRQ IRQ IRQ IRQ IRQ IRQ GPIO GPIO GPIO IRQ IRQ IRQ Sheet.121 MCU MCU Vertical Wire Bundle.203 Label Text 10pt.1046 n n Sheet.205 Vertical Wire Bundle.206 Label Text 10pt.1046 n n Sheet.208 Vertical Wire Bundle.209 Label Text 10pt.1046 n n Sheet.211 Vertical Wire Bundle.212 Label Text 10pt.1046 n n Sheet.214 Vertical Wire Bundle.215 Label Text 10pt.1046 n n Sheet.217 Vertical Wire Bundle.218 Label Text 10pt.1046 2 2 Sheet.220 Vertical Wire Bundle.221 Label Text 10pt.1046 4 4 Sheet.223 Vertical Wire Bundle.224 Label Text 10pt.1046 4 4 Sheet.226 Vertical Wire Bundle.227 Label Text 10pt.1046 2 2 Sheet.229

MCU

RA Arm Cortex-M MCUs
RX 32-Bit Performance/Efficiency MCUs

MPU

RZ 32 & 64-Bit MPUs

DC/DC

Buck Regulators (Integrated FETs)

DC/DC

Buck Regulators (Integrated FETs)

DC/DC

Buck Regulators (Integrated FETs)

PMIC

Multi-Channel Power Management ICs (PMICs)

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