General Description
    The Raspberry Pi Compute Module 4 (CM4) is a System on Module (SoM) containing processor, memory, eMMC Flash, and supporting power circuitry. These modules allow a designer to leverage the Raspberry Pi hardware and software stack in their own custom systems and form factors. In addition, these modules have extra IO interfaces over and above what is available on the Raspberry Pi boards, opening up more options for the designer.

Features
• Broadcom BCM2711, quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
• Small Footprint 55mm × 40mm × 4.7mm module
 ◦4 × M2.5 mounting holes
• H.265 (HEVC) (upto 4Kp60 decode), H.264 (upto 1080p60 decode, 1080p30 encode)
• OpenGL ES 3.0 graphics
• Options for 1GB, 2GB, 4GB or 8GB LPDDR4-3200 SDRAM with ECC (see Appendix B)
• Options for 0GB (CM4Lite), 8GB, 16GB, or 32GB eMMC flash memory (see Appendix B)
 ◦Peak eMMC bandwidth 100MBps (four times faster than previous Compute Modules)
• Option (see Appendix B) for certified radio module with:
 ◦2.4 GHz, 5.0 GHz IEEE 802.11 b/g/n/ac wireless
 ◦Bluetooth 5.0, BLE
 ◦On board electronic switch to select between PCB trace or external antenna
• Gigabit Ethernet PHY supporting IEEE 1588
• 1 × PCIe 1-lane Host, Gen 2 (5Gbps)
• 1 × USB 2.0 port (high speed)
• 28 × GPIO supporting either 1.8V or 3.3V signalling and peripheral options:
 ◦Up to 5 × UART
 ◦Up to 5 × I2C
 ◦Up to 5 × SPI
 ◦1 × SDIO interface
 ◦1 × DPI (parallel RGB display)
 ◦1 × PCM
 ◦Up to 2× PWM channels
 ◦Up to 3× GPCLK outputs
• 2 × HDMI 2.0 ports (up to 4Kp60 supported)
• MIPI DSI:
 ◦1 × 2-lane MIPI DSI display port
 ◦1 × 4-lane MIPI DSI display port
• MIPI CSI-2:
 ◦1 × 2-lane MIPI CSI camera port
 ◦1 × 4-lane MIPI CSI camera port
• 1 × SDIO 2.0 (CM4Lite)
• Single +5V PSU input.

General Parameters

Dimension	50mmL*40mmW*4.7mmH
Connection Mode	Board To Board
CPU	Broadcom BCM2711，1.5 GHz，64-bit，4Core，ARM Cortex-A72，1MB shared L2 cache
GPU	500MHz VideoCore Vi
Memory	1GB、2GB、4GB or 8GB LPDDR4-3200 SDRAM
Storage	EMMC 5.1 8G
Power Management
Supply Voltage	5.0V 1.25A
Operating System	Raspbian OS
Operating Temperature	-20°C to +85°C

Absolute Maximum Ratings

Electrical Characteristics

Ordering codes

Module	Wireless	RAM	eMMC
CM4	1 = Yes	01 = 1GB	000 = 0GB (Lite)
	0 = No	02 = 2GB	008 = 8GB
		04 = 4GB	016 = 16GB
		08 = 8GB	032 = 32GB
eg： CM4104032 is CM4 module，with Wireless (1)
4GB Memory (04)，32G eMMC Flash (032)。
Wireless	RAM	eMMC	Model Name
×	1GB	0GB (Lite)	CM4001000
×	1GB	8GB	CM4001008
×	1GB	16GB	CM4001016
×	1GB	32GB	CM4001032
×	2GB	0GB (Lite)	CM4002000
×	2GB	8GB	CM4002008
×	2GB	16GB	CM4002016
×	2GB	32GB	CM4002032
×	4GB	32GB	CM4004032
PCB/ext	2GB	0GB (Lite)	CM4102000
PCB/ext	2GB	8GB	CM4102008
PCB/ext	2GB	16GB	CM4102016
PCB/ext	2GB	32GB	CM4102032
PCB/ext	4GB	0GB (Lite)	CM4104000
PCB/ext	4GB	8GB	CM4104008
PCB/ext	4GB	16GB	CM4104016
PCB/ext	4GB	32GB	CM4104032

Functional Block Diagram

Interface Description

Functional Pin Description

Pin	Signal	Description
1	GND	Ground (0V)
2	GND	Ground (0V)
3	Ethernet_Pair3_P	Ethernet pair 3 positive (connect to transformer or MagJack)
4	Ethernet_Pair1_P	Ethernet pair 1 positive (connect to transformer or MagJack)
5	Ethernet_Pair3_N	Ethernet pair 3 negative (connect to transformer or MagJack)
6	Ethernet_Pair1_N	Ethernet pair 1 negative (connect to transformer or MagJack)
7	GND	Ground (0V)
8	GND	Ground (0V)
9	Ethernet_Pair2_N	Ethernet pair 2 negative (connect to transformer or MagJack)
10	Ethernet_Pair0_N	Ethernet pair 0 negative (connect to transformer or MagJack)
11	Ethernet_Pair2_P	Ethernet pair 2 positive (connect to transformer or MagJack)
12	Ethernet_Pair0_P	Ethernet pair 0 positive (connect to transformer or MagJack)
13	GND	Ground (0V)
14	GND	Ground (0V)
15	Ethernet_nLED3	Active-low Ethernet activity indicator (3.3V signal): typically a green LED is connected to this pin. IOL = 8mA @ VOL < 0.4V
16	Ethernet_SYNC_IN	IEEE1588 SYNC Input pin (1.8V signal: IOL = 8mA @ VOL < 0.4V)
17	Ethernet_nLED2	Active-low Ethernet speed indicator (3.3V signal): typically a yellow LED is connected to this pin. A low state indicates the 1Gbit or 100Mbit link: IOL = 8mA @ VOL < 0.4V
18	Ethernet_SYNC_OUT	IEEE1588 SYNC Output pin (1.8V signal: IOL = 8mA @ VOL < 0.4V)
19	Ethernet_nLED1	Active-low Ethernet speed indicator (3.3V signal): typically a yellow LED is connected to this pin. A low state indicates the 1Gbit or 10Mbit link: IOL = 8mA @ VOL < 0.4V
20	EEPROM_nWP	Leave floating NB internally pulled up to CM4_3.3V via 100kΩ (VIL < 0.8V), but can be grounded to prevent writing to the on-board EEPROM which stores the bootcode
21	Pi_nLED_Activity	Active-low Pi activity LED. 20mA Max 5V tolerant (VOL < 0.4V). (this is the signal that drives the green LED on the Raspberry Pi 4 Model B)
22	GND	Ground (0V)
23	GND	Ground (0V)
24	GPIO26	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
25	GPIO21	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
26	GPIO19	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
27	GPIO20	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
28	GPIO13	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
29	GPIO16	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
30	GPIO6	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
31	GPIO12	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
32	GND	Ground (0V)
33	GND	Ground (0V)
34	GPIO5	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
35	ID_SC	(BCM2711 GPIO 1) GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
36	ID_SD	(BCM2711 GPIO 0) GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
37	GPIO7	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
38	GPIO11	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
39	GPIO8	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
40	GPIO9	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
41	GPIO25	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
42	GND	Ground (0V)
43	GND	Ground (0V)
44	GPIO10	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
45	GPIO24	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
46	GPIO22	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
47	GPIO23	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
48	GPIO27	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
49	GPIO18	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
50	GPIO17	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
51	GPIO15	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
52	GND	Ground (0V)
53	GND	Ground (0V)
54	GPIO4	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
55	GPIO14	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V
56	GPIO3	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V. Internal 1.8kΩ pull up to GPIO_VREF
57	SD_CLK	SD card clock signal (only available on CM4Lite)
58	GPIO2	GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to 1.8V. Internal 1.8kΩ pull up to GPIO_VREF
59	GND	Ground (0V)
60	GND	Ground (0V)
61	SD_DAT3	SD card/eMMC Data3 signal (only available on CM4Lite)
62	SD_CMD	SD card/eMMC Command signal (only available on CM4Lite)
63	SD_DAT0	SD card/eMMC Data0 signal (only available on CM4Lite)
64	SD_DAT5	SD card/eMMC Data5 signal (only available on CM4Lite)
65	GND	Ground (0V)
66	GND	Ground (0V)
67	SD_DAT1	SD card/eMMC Data1 signal (only available on CM4Lite)
68	SD_DAT4	SD card/eMMC Data4 signal (only available on CM4Lite)
69	SD_DAT2	SD card/eMMC Data2 signal (only available on CM4Lite)
70	SD_DAT7	SD card/eMMC Data7 signal (only available on CM4Lite)
71	GND	Ground (0V)
72	SD_DAT6	SD card/eMMC Data6 signal (only available on CM4Lite)
73	SD_VDD_OVERRIDE	Connect to CM4_3.3V to force SD card/eMMC interface to 1.8V signalling instead of 3.3V, otherwise leave unconnected. Typically only used if external eMMC is connected.
74	GND	Ground (0V)
75	SD_PWR_ON	Output to power-switch for the SD card. The CM4 sets this pin high (3.3V) to signal that power to the SD card should be turned on. If booting from the SD card is required then a pullup should also be fitted so the power-switch defaults to on. (only available on CM4Lite)
76	Reserved	Do not connect anything to this pin.
77	+5V	(Input) 4.75V-5.25V. Main power input
78	GPIO_VREF	Must be connected to CM4_3.3V (pins 84 and 86) for 3.3V GPIO or CM4_1.8V (pins 88 and 90) for 1.8V GPIO. This pin cannot be floating or connected to ground.
79	+5V	(Input) 4.75V-5.25V. Main power input
80	SCL0	I2C clock pin (BCM2711 GPIO45): typically used for Camera and Display. Internal 1.8kΩ pull up to CM4_3.3V
81	+5V	(Input) 4.75V-5.25V. Main power input
82	SDA0	I2C Data pin (BCM2711 GPIO44): typically used for Camera and Display. Internal 1.8kΩ pull up to CM4_3.3V
83	+5V	(Input) 4.75V-5.25V. Main power input
84	CM4_3.3V	(Output) 3.3V ± 2.5%. Power Output max 300mA per pin for a total of 600mA. This will be powered down during power-off or GLOBAL_EN being set low
85	+5V	(Input) 4.75V-5.25V. Main power input
86	CM4_3.3V	(Output) 3.3V ± 2.5%. Power Output max 300mA per pin for a total of 600mA. This will be powered down during power-off or GLOBAL_EN being set low
87	+5V	(Input) 4.75V-5.25V. Main power input
88	CM4_1.8V	(Output) 1.8V ± 2.5%. Power Output max 300mA per pin for a total of 600mA. This will be powered down during power-off or GLOBAL_EN being set low
89	WL_nDisable	Can be left floating; if driven low the wireless interface will be disabled. Internally pulled up via 1.8kΩ to CM4_3.3V
90	CM4_1.8V	(Output) 1.8V ± 2.5%. Power Output max 300mA per pin for a total of 600mA. This will be powered down during power-off or GLOBAL_EN being set low
91	BT_nDisable	Can be left floating; if driven low the Bluetooth interface will be disabled. Internally pulled up via 1.8kΩ to CM4_3.3V
92	RUN_PG	Bidirectional pin. Can be driven low (via a 220Ω resistor) to reset the CM4 CPU. As an output, a high signals that power is good and CPU is running. Internally pulled up to +3.3V via 10kΩ
93	nRPIBOOT	A low on this pin forces booting from an RPI server (e.g. PC or a Raspberry Pi); if not used leave floating. Internally pulled up via 10kΩ to +3.3V
94	AnalogIP1	Analogue input of the MXL7704: typically connected to CC pin of Type C power connector
95	PI_LED_nPWR	Active-low output to drive Power On LED. This signal needs to be buffered.
96	AnalogIP0	Analogue input of the MXL7704: typically connected to CC pin of Type C power connector
97	Camera_GPIO	Typically used to shut down the camera to reduce power. Reassigning this pin to another function isn’t recommended. CM4_3.3V signalling
98	GND	Ground (0V)
99	GLOBAL_EN	Input. Drive low to power off CM4. Internally pulled up with a 100kΩ to +5V
100	nEXTRST	Output. Driven low during reset; Driven high (CM4_3.3V) once CM4 CPU has started to boot
101	USB_OTG_ID	Input (3.3V signal) USB OTG Pin. Internally pulled up. When grounded the CM4 becomes a USB host but the correct OS driver also needs to be used
102	PCIe_CLK_nREQ	Input (3.3V signal) PCIe clock request pin (low to request PCI clock). Internally pulled up
103	USB_N	USB D-
104	Reserved	Do not connect anything to this pin.
105	USB_P	USB D+
106	Reserved	Do not connect anything to this pin.
107	GND	Ground (0V)
108	GND	Ground (0V)
109	PCIe_nRST	Output (+3.3V signal) PCIe reset active-low
110	PCIe_CLK_P	PCIe clock Out positive (100MHz) NB AC coupling capacitor included on CM4
111	VDAC_COMP	Video DAC output (TV OUT)
112	PCIe_CLK_N	PCIe clock Out negative (100MHz) NB AC coupling capacitor included on CM4
113	GND	Ground (0V)
114	GND	Ground (0V)
115	CAM1_D0_N	Input Camera1 D0 negative
116	PCIe_RX_P	Input PCIe GEN 2 RX positive NB external AC coupling capacitor required
117	CAM1_D0_P	Input Camera1 D0 positive
118	PCIe_RX_N	Input PCIe GEN 2 RX negative NB external AC coupling capacitor required
119	GND	Ground (0V)
120	GND	Ground (0V)
121	CAM1_D1_N	Input Camera1 D1 negative
122	PCIe_TX_P	Output PCIe GEN 2 TX positive NB AC coupling capacitor included on CM4
123	CAM1_D1_P	Input Camera1 D1 positive
124	PCIe_TX_N	Output PCIe GEN 2 TX positive NB AC coupling capacitor included on CM4
125	GND	Ground (0V)
126	GND	Ground (0V)
127	CAM1_C_N	Input Camera1 clock negative
128	CAM0_D0_N	Input Camera0 D0 negative
129	CAM1_C_P	Input Camera1 clock positive
130	CAM0_D0_P	Input Camera0 D0 positive
131	GND	Ground (0V)
132	GND	Ground (0V)
133	CAM1_D2_N	Input Camera1 D2 negative
134	CAM0_D1_N	Input Camera0 D1 negative
135	CAM1_D2_P	Input Camera1 D2 positive
136	CAM0_D1_P	Input Camera0 D1 positive
137	GND	Ground (0V)
138	GND	Ground (0V)
139	CAM1_D3_N	Input Camera1 D3 negative
140	CAM0_C_N	Input Camera0 clock negative
141	CAM1_D3_P	Input Camera1 D3 positive
142	CAM0_C_P	Input Camera0 clock positive
143	HDMI1_HOTPLUG	Input HDMI1 hotplug. Internally pulled down with a 100kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
144	GND	Ground (0V)
145	HDMI1_SDA	Bidirectional HDMI1 SDA. Internally pulled up with a 1.8kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
146	HDMI1_TX2_P	Output HDMI1 TX2 positive
147	HDMI1_SCL	Bidirectional HDMI1 SCL. Internally pulled up with a 1.8kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
148	HDMI1_TX2_N	Output HDMI1 TX2 negative
149	HDMI1_CEC	Input HDMI1 CEC. Internally pulled up with a 27kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
150	GND	Ground (0V)
151	HDMI0_CEC	Input HDMI0 CEC. Internally pulled up with a 27kΩ. 5V tolerant (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
152	HDMI1_TX1_P	Output HDMI1 TX1 positive
153	HDMI0_HOTPLUG	Input HDMI0 hotplug. Internally pulled down 100kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
154	HDMI1_TX1_N	Output HDMI1 TX1 negative
155	GND	Ground (0V)
156	GND	Ground (0V)
157	DSI0_D0_N	Output Display0 D0 negative
158	HDMI1_TX0_P	Output HDMI1 TX0 positive
159	DSI0_D0_P	Output Display0 D0 positive
160	HDMI1_TX0_N	Output HDMI1 TX0 negative
161	GND	Ground (0V)
162	GND	Ground (0V)
163	DSI0_D1_N	Output Display0 D1 negative
164	HDMI1_CLK_P	Output HDMI1 clock positive
165	DSI0_D1_P	Output Display0 D1 positive
166	HDMI1_CLK_N	Output HDMI1 clock negative
167	GND	Ground (0V)
168	GND	Ground (0V)
169	DSI0_C_N	Output Display0 clock negative
170	HDMI0_TX2_P	Output HDMI0 TX2 positive
171	DSI0_C_P	Output Display0 clock positive
172	HDMI0_TX2_N	Output HDMI0 TX2 negative
173	GND	Ground (0V)
174	GND	Ground (0V)
175	DSI1_D0_N	Output Display1 D0 negative
176	HDMI0_TX1_P	Output HDMI0 TX1 positive
177	DSI1_D0_P	Output Display1 D0 positive
178	HDMI0_TX1_N	Output HDMI0 TX1 negative
179	GND	Ground (0V)
180	GND	Ground (0V)
181	DSI1_D1_N	Output Display1 D1 negative
182	HDMI0_TX0_P	Output HDMI0 TX0 positive
183	DSI1_D1_P	Output Display1 D1 positive
184	HDMI0_TX0_N	Output HDMI0 TX0 negative
185	GND	Ground (0V)
186	GND	Ground (0V)
187	DSI1_C_N	Output Display1 clock negative
188	HDMI0_CLK_P	Output HDMI0 clock positive
189	DSI1_C_P	Output Display1 clock positive
190	HDMI0_CLK_N	Output HDMI0 clock negative
191	GND	Ground (0V)
192	GND	Ground (0V)
193	DSI1_D2_N	Output Display1 D2 negative
194	DSI1_D3_N	Output Display1 D3 negative
195	DSI1_D2_P	Output Display1 D2 positive
196	DSI1_D3_P	Output Display1 D3 positive
197	GND	Ground (0V)
198	GND	Ground (0V)
199	HDMI0_SDA	Bidirectional HDMI0 SDA. Internally pulled up with a 1.8kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)
200	HDMI0_SCL	Bidirectional HDMI0 SCL. Internally pulled up with a 1.8kΩ. 5V tolerant. (It can be connected directly to a HDMI connector; a small amount of ESD protection is provided on the CM4 by an on-board HDMI05-CL02F3)

Key IC
    Broadcom BCM2711

Appearance And Structure