DLPU115 User guide | 德州仪器 TI.com.cn

DLPU115 January 2022 DLPC3421

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3.4.3.2 Write Parameters

Table 3-39 describes the command parameters.

Table 3-39 Write Parameters

Parameter Bytes	Description
Byte 1	Projection pitch angle (LSByte)
Byte 2	Projection pitch angle (MSByte)

Default: 0000h

Figure 3-63 shows the bit order and weighting for the two’s complement projection pitch angle data.

Figure 3-63 Bit Weight Definition for the Projection Pitch Angle Data

b15	b14	b13	b12	b11	b10	b9	b8	b7	b6	b5	b4	b3	b2	b1	b0
2⁷	2⁶	2⁵	2⁴	2³	2²	2¹	2⁰	2^–1	2^–2	2^–3	2^–4	2^–5	2^–6	2^–7	2^–8

This command is used in conjunction with the Write Keystone Correction Control command.

The projection pitch angle is limited to the solution space in Table 3-40 for nHD (DLPC3421) and in Table 3-41 for QnHD (DLPC3420). Figure 3-64 shows examples of the projection pitch angle.

Table 3-40 nHD Keystone Projection Pitch Limits

Throw Ratio Range	0.2 to 0.4	0.4 to 0.6	0.6 to 0.8	0.8 to 1.0	1.0 to 2.0	1.0 to 1.2	1.2 to 2.0
Max Pitch	-40	-40	-40	-40	-40	-40	-40
Min Pitch	5	10	15	20	20	20	25

Table 3-41 QnHD Keystone Projection Pitch Limits

Throw Ratio Range	0.2 to 0.4	0.4 to 0.6	0.6 to 0.8	0.8 to 1.0	1.0 to 2.0	1.0 to 1.2	1.2 to 2.0
Max Pitch	-40	-40	-40	-40	-40	-40	-40
Min Pitch	15	25	40	40	40	40	40

Figure 3-64 Examples of Projection Pitch Angle