DA8xx Schematic Review

Schematic review

This page describes for typical schematic review points of hardware design.

• Target reader is the user who checks the original hardware board design.
• Usually this page is needed after finishing PCB board design & before sending CAD data to PCB manufacturer.

Check whether all the VSS, CVDD, DVDD correctly hooked up?

ZKB				PTP
CVDD(RVDD)	DVDD	GND		CVDD(RVDD)	DVDD	GND
1.2V	3.3V	0V		1.2V	3.3V	0V
F6,G6, G7, G10, G11, H6, H7, H10, H11, H12, J6, J7, J10, J11, J12, K6, K7, K10, K11,L6	B16, E5, E8, E9, E12, F5, F11, F12, G5, G12, K5, K12, L5, L11, L12, M5, M8, M9, M12, R1, R16	DSP Only Device	DSP + ARM Device
		A1, A2, A3,A15, A16,B2, B3, E6, E7, E10, E11, F8, F9, F10, G8, G9, H8, H9, J8, J9, K8, K9, L7, L8, L9, L10, M6, M7, M10, M11, T1, T2, T15, T16	A1, A2, A15, A16, B2, E6, E7, E10, E11, F8, F9, F10, G8, G9, H8, H9, J8, J9, K8, K9, L7, L8, L9, L10, M6, M7, M10, M11, T1, T2, T15, T16	10, 20, 28, 38, 50, 56, 61, 69, 77, 93, 104, 114, 147, 154, 161, 167, 67, 159	5, 15, 24, 33, 43, 47, 53, 58, 65, 71, 75, 81, 87, 90, 99, 109, 119, 128, 151, 158, 164, 172,	177 (Thermal Pad)

Check other power related pins

PLL0 pins, which are needed filtered supply

PLL0_VDDA		PLL0_VSSA
1.2V Filtered		0V Filtered
PTP	ZKB	PTP	ZKB
141	D1	142	E1

Please refer below figure,

RTC CVDD

Even when RTC is not used, please tie the RTC_CVDD pin to 1.2V, and of course RTC_Vss to GND.

RTC_CVDD (1.2V) ( isolated from rest of chip CVDD)		RTC_VSS (GND) Oscillator ground (for filter)
PTP	ZKB	PTP	ZKB
149	G1	None	G2

Check Reserved pins?

	PTP	ZKB
RSV1	None	F7		OPEN
RSV2	133	B1		CVDD(1.2V)
NC	139	H4		OPEN
NC	136	F3		OPEN
		DSP Only Device	DSP +ARM Devoce
NC	None	C1	None	Open
NC	None	C2	None	Open

Check JTAG related pins?

		PTP	ZKB
TMS		152	J1	Connect to 14pin JTAG Connectors
TDI		153	J2	Connect to 14pin JTAG Connectors
TDO		156	J3	Connect to 14pin JTAG Connectors
TCK		155	H3	Connect to 14pin JTAG Connectors
TRST		150	J4	Connect to 14pin JTAG Connectors with pull down via 4.7K ohm
EMU[0]		None	J5	Connect to 14pin JTAG Connectors with pull Up via 4.7K ohm
DSP Only Device	DSP+ARM Device
None	RTCK	157	K1	Connect to 14pin JTAG Connectors

If the information about JTAG Connectors is needed please refer the JTAG Connectors

Check Unused Pins ?

USB unused pins

	PTP	ZKB		USB0: no use USB1: no use	USB0: Use USB1: No use
USB0_DM	138	G4		Open	Use Properly
USB0_DP	137	F4		Open	Use Properly
USB0_VDDA33	140	H5		Open	3.3V
USB0_VDDA18	135	E3		Open	1.8V
USB0_ID	None	D2		Open	Use Properly
USB0_VBUS	None	D3		Open	Use Properly
USB0_DRVVBUS/GP4[15]	none	E4		Open/GPIO	Use properly
USB0_VDDA12 (Output Pin!)	134	C3		Open	GND via 0.22-uF
		DSP Only Device	DSP+ ARM Device
USB1_DM	None	None	B3	Open	GND
USB1_DP	None	None	A3	Open	GND
USB1_VDDA33	None	None	C1	Open	Open
USB1_VDDA18	None	None	C2	Open	Open
AHCLKX0/AHCLKX2/USB_REFCLKIN/GP2[11]	125	B5		Open /Set other function	Use Properly

RTC unused pins

When RTC is not used, please tie the RTC_XI pin to GND. Do not leave as floating.
RTC_XO should be opened.

RTC_XI (tie to GND)		RTC_XO(Open)
PTP	ZKB	PTP	ZKB
148	H1	None	H2

Check OSC related pins

OSCIN is a 1.2V input. So please make sure that the signal driving it stays between CVDD and VSS. This pin will not tolerate 3.3V

Check Reset Related pins

	PTP	ZKB
_RESET	146	G3	Device Reset Input
AMUTE0/_RESETOUT	None	L4	Reset output (Open Drain, when _RESETOUT)

Check the others, based on the above information ?

Click & see each linked page information.

1. SDRAM
2. Flash Memory
3. Communication
4. Audio Clock routing