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RM3100 Evaluation Board User Manual Page 9 of 33

4.3 RM3100 Evaluation Board Pin Assignments

The RM3100 Evaluation Board’s pin assignments are summarized below in Table 4-1. Pin

numbers run counterclockwise, when looking from the top, starting at the Pin 1 designator as

shown in Figure 3-1.

Table 4-1: RM3100 Evaluation Board Pin Assignments

Pin#

Pin Name

Description

SCK /

SCL

SPI interface (SCK) – Serial clock input

C interface (SCL) – Serial clock line

SO /

SA1

SPI interface (SO) – Master Input, Slave Output

C interface – Bit 1 of slave address

SDA

SPI interface (SI) – Master Output, Slave Input Serial Data

C interface (SDA) – Serial Data Line

SSN /

SA0

SPI interface – Active low to select port

C interface – Bit 0 of slave address

DRDY

Status line

AVSS

Ground pin for analog section of ASIC

I2CEN

C enable pin (HIGH = I

C, LOW = SPI)

DVDD

Supply voltage for digital section of ASIC.

AVDD

Supply voltage for analog section of ASIC

DVSS

Ground pin for digital section of ASIC

6, 8, 9, 11

Do not connect

4.3.1 General Purpose Pins

DVDD and AVDD (pins 12 & 13)

AVDD and DVDD should be tied to the analog and digital supply voltages,

respectively. The recommend voltages are defined in Table 3-3, and the maximum

voltages are given in Table 3-2. DVDD must be on whenever AVDD is on, so

DVDD should either be brought up first or at precisely the same time as AVDD.

AVDD can be turned off when not making a measurement to conserve power, since

all other operations are supported with DVDD. Under this condition, register values

will be retained as long as DVDD is powered. Also, AVDD must be within 0.1 V of

DVDD when AVDD is on.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 32 33

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