LMP90100MHESLASHNOPB datasheet(36/69 Pages) TI1

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R/WB = Read/Write Data

0: Write Data

1: Read Data

[3:0]

[N:0]

R/WB

SZ = Size

0x0: 1 byte

0x1: 2 bytes

0x2: 3 bytes

0x3: Streaming ± 3+ bytes until CSB is de-asserted

[6:5]

Lower Register

Address (LRA)

Data Byte (s)

Instruction Byte 2 (INST2)

Data Byte (s)

[7:0]

[7:3]

[2:0]

0x0

Upper Register

Address (URA)

Instruction Byte 1 (INST1)

Upper Address Byte (UAB)

R/WB = Read/Write Address

0x10: Write Address

0x90: Read Address

RA/WAB

Transaction 2 ± Data Access

Transaction 1 ± URA Setup ± necessary only when the previous URA is different than the desired URA.

LMP90100

SNAS510P – JANUARY 2011 – REVISED MARCH 2013

www.ti.com

Figure 51 shows the protocol how to write to or read from a register.

Transaction 1 sets up the upper register address (URA) where the user wants to start the register-write or

Transaction 2 sets the lower register address (LRA) and includes the Data Byte(s), which contains the incoming

data from the master or outgoing data from the LMP90xxx.

Examples of register-reads or register-writes can be found in REGISTER READ/WRITE EXAMPLES.

Figure 51. Register Read/Write Protocol

Streaming

When writing/reading 3+ bytes, the user must operate the device in Normal Streaming mode or Controlled

Streaming mode. In the Normal Streaming mode, which is the default mode, data runs continuously starting from

ADDR until CSB deasserts. This mode is especially useful when programming all the configuration registers in a

single transaction. See Normal Streaming Example for an example of the Normal Streaming mode.

In the Controlled Streaming mode, data runs continuously starting from ADDR until the data has run through all

(STRM_RANGE + 1) registers. For example, if the starting ADDR is 0x1C, STRM_RANGE = 5, then data will be

written to or read from the following ADDRs: 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21. Once the data reaches ADDR

0x21, LMP90xxx will wrap back to ADDR 0x1C and repeat this process until CSB deasserts. See Controlled

Streaming Example for an example of the Controlled Streaming mode.

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LMP90100MHE/NOPB Datasheet(PDF) 36 Page - Texas Instruments

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