7. SP7021 Reference Circuit

1 0.9V Power Tree
2 1.2V Power Tree
3 1.5V Power Tree
4 MIPI-CSI
5 HDMI TX
6 USB
7 X'tal
8 JTAG/SWD
9 UART
10 eMMC
11 SD card
12 Ethernet
13 I2C
14 SPI
15 FPGA
16 SPI NAND
17 SPI NOR

0.9V Power Tree

There is a feedback loop in DC to DC 0.9 circuit, and the 0.9V output is the power source of the C chip.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
VDD09_A	33, 36, 57	Power	Power for C chip
DCDC09_FB	58	Analog Input	Feedback Voltage
DCDC09_VI_VDD33	59	Analog Input	3.3V Power Input
DCDC09_VO	60	Analog Output	0.9V Power Output

Notice:

(1) In typical cases, the internal DC-DC 0.9V efficiency is 73.45~88.16%

Recommended Bead Electrical characteristics：

Part Number: ACMS160808A600

Impedance@100MHz, ohm+/-25%: 60

DC Resistance, ohm(max): 0.04

Rated Current mA(max): 3000

1.2V Power Tree

1.2V is the power source for the CPU chip and Peripheral chip.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
VDD12_A	35, 56	Power	Power for C chip
CVDD12	23, 46, 79, 108, 154	Power	Power for P chip
VDD12_STH	34	Power	Power for CPIO South side
VDD12_EST	55	Power	Power for CPIO east side
HDMITX_PLL_AVDD12	136	Power	Power for HDMI
PLL_CVDD12	156	Power	Power for PLL
DDR3-PHY-1.2CORE	159, 161	Power	DDR3-PHY core power
DCDC12_VO	171	Analog Output	1.2V Power Output
DCDC12_VI_VDD33	172	Analog Input	3.3V Power Input

Notice:

(1) 1.2V external power is needed if 1.2V consumes current more than 1200mA

(2) In typical cases, the internal DC-DC 1.2V efficiency is 76.68~84.87%

Recommended Bead Electrical characteristics：

Part Number: ACMS160808A600

Impedance@100MHz, ohm+/-25%: 60

DC Resistance, ohm(max): 0.04

Rated Current mA(max): 3000

1.5V Power Tree

1.5V is the power of built-in DDR and DDR-PHY

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
DDR3-K-VDDQ	157, 166	Power	DDR3 KGD IO power
DDR3-PHY-VDDQ	158, 160, 162	Power	DDR3-PHY IO power
DDR3-PHY-3.3PLL	163	Power	DDR3-PHY PLL power
DDR3-PHY-VREF	164	Analog Input	DDR3-PHY reference voltage
DDR3-PHY-PZQ	165	Analog Output	DDR3-PHY external reference resistor
DCDC15_VI_VDD33	167	Analog Input	3.3V Power Input
DCDC15_VO	168	Analog Output	1.5V Power Output

Notice:

(1) In typical cases, the internal DC-DC 1.5V efficiency is 80.43~90.38%

Recommended Bead Electrical characteristics：

Part Number: ACMS160808A600

Impedance@100MHz, ohm+/-25%: 60

DC Resistance, ohm(max): 0.04

Rated Current mA(max): 3000

MIPI-CSI

There is one MIPI-CSI Rx interface in SP7021. Two used application circuits are shown as below. One is 4 lane OV9282 camera module, and the other is 1 lane GC0310 camera module.

https://www.ovt.com/sensors/OV9282

http://www.gcoreinc.com/product/showproduct.php?lang=cn&id=32

Note : MIPI layout impedance 100 ohm

Pin Name	Pin Number	Type	Description	Remark

Pin Name	Pin Number	Type	Description	Remark
MIPI_D3N	143	Analog Input	MIPI Lane3, Data-
MIPI_D3P	144	Analog Input	MIPI Lane3, Data+
MIPI_D1N	145	Analog Input	MIPI Lane1 Data-
MIPI_D1P	146	Analog Input	MIPI Lane1, Data+
MIPI_SN	147	Analog Input	MIPI Clock-
MIPI_SP	148	Analog Input	MIPI Clock+
MIPI_D0N	149	Analog Input	MIPI Lane0, Data-
MIPI_D0P	150	Analog Input	MIPI Lane0, Data+
MIPI_D2N	151	Analog Input	MIPI Lane2, Data-
MIPI_D2P	152	Analog Input	MIPI Lane2, Data+
MIPIAVDD	153	Power	MIPI 1.2V power
GPIO_P0_0	174	Digital Output	MIPI power down control siganl	any GPIO
GPIO_P8_5	85	Digital I/O	MIPI I2C control data (MPI_SDA)	I2C in PinMux
GPIO_P8_6	86	Digital I/O	MPI I2C control clock (MIPI_SCL)	I2C in PinMux

HDMI TX

Pin 134 ~ 142 are the HDMI signal output, and there are three control pins need to be assigned for

Note : Differential signals (TXCP/N, TXD0P/N, TXD1P/N and TXD2P/N): 50ohm single_ended, and 100ohm differential

Pin Name	Pin Number	Type	Description	Remark

Pin Name	Pin Number	Type	Description	Remark
HDMITX_CN	134	Analog Output
HDMITX_CP	135	Analog Output
HDMI_AVDD12	136	Power	HDMI TX PLL Power
HDMITX_DN0	137	Analog Output
HDMITX_DP0	138	Analog Output
HDMITX_DN1	139	Analog Output
HDMITX_DP1	140	Analog Output
HDMITX_DN2	141	Analog Output
HDMITX_DP2	142	Analog Output
DDC_SDA	112, 76, 85	Digital Output	Display Data Chanel Serial Data	dedicated pin
DDC_SCL	113, 77, 86	Digital Output	Display Data Chanel Serial Clock	dedicated pin
HDMI_HPD	114, (any)	Digital Input	Hot Plug Detection	GPIO

USB

There have two USB ports in SP7021. They all support OTG mode. Please check below table with signals list.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
USB0_VBUS	125	Power	USB0 bus power
USB0_ID	126	Digital Input	USB0_ID signal
USB0_DM	127	Analog I/O	USB0_DM signal
USB0_DP	128	Analog I/O	USB0_DP signal
USB1_DP	130	Analog I/O	USB1_DP signal
USB1_DM	131	Analog I/O	USB1_DM signal
USB1_ID	132	Digital Input	USB1_ID signal
USB1_VBUS	133	Power	USB1 bus power

X'tal

There have two X’tal source in SP7021. One is 27MHz at pin 110 and 111, the other one is 32KHz at pin123 and 124. Please check below table with signals list.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
XTAL_IN	110	Analog Input	XTAL_IN signal
XTAL_OUT	111	Analog Output	XTAL_OUT signal
XTAL32K_IN	123	Analog Input	XTAL32K_IN signal
XTAL32K_OUT	124	Analog Output	XTAL32K_OUT signal

Best Crystal Compatiblity：

Crystal ESR < 100W、C_LOAD = 20pF,。

recommended oscillator circuit ：R_FB = 4.7KW、C_IN = C_OUT = 18pF。

For reducing EMI：

Crystal ESR < 100W、C_LOAD = 20pF, DO NOT choose triple frequency crystal。

recommended oscillator circuit ：R_FB = 1MW、C_IN = C_OUT = 10pF。

JTAG/SWD

JTAG function pins locate at pin104, 105, 106, 107, 112 and 113. SWD function pins locate at pin102 and 103. Please check below table with signals list.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
SWD_CLK	102	Digital Output	SWD clock signal
SWD_DATA	103	Digital I/O	SWD data signal
JTAG_TDO	104	Digital Output	JTAG_TDO signal
JTAG_RTCK	105	Digital Output	JTAG_RTCK signal
JTAG_TCLK	106	Digital Output	JTAG_TCLK signal
JTAG_TMS	107	Digital Output	JTAG_TMS signal
JTAG_TDI	112	Digital Input	JTAG_TDI signal
JTAG_TRST	113	Digital Output	JTAG_TRST signal

UART

UART0 function pins locate at pin98 and 99. Please check below table with signals list.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
UA0_TX	98	Digital Output	UART0 transmitter signal
UA0_RX	99	Digital Input	UART0 receiver signal

UART1~4 function pins can be output from any GPIOMUX pins by set correct register value. Below figure shows the example of UART2 reference circuit.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
UA2_TX	15	Digital Output	UART2 transmitter signal
UA2_RX	16	Digital Input	UART2 receiver signal
UA2_RTS	17	Digital Output	UART2 RTS signal
UA2_CTS	18	Digital Output	UART2 CTS signal

eMMC

EMMC function pins locate at pin88~97. Please check below table with signals list. The application circuit eMMC component use Micron MTFC4GACAJCN-4M IT.

Pin Name	Pin Number	Type	Description

Pin Name	Pin Number	Type	Description
EMMC_CMD	88	Digital Output	EMMC command signal
EMMC_D5	89	Digital I/O	EMMC data signal
EMMC_D3	90	Digital I/O	EMMC data signal
EMMC_D4	91	Digital I/O	EMMC data signal
EMMC_D0	92	Digital I/O	EMMC data signal
EMMC_D1	93	Digital I/O	EMMC data signal
EMMC_CLK	94	Digital Output	EMMC clock signal
EMMC_D2	95	Digital I/O	EMMC data signal
EMMC_D7	96	Digital I/O	EMMC data signal
EMMC_D6