ZSSC3018 Datasheet

© 2020 Renesas Electronics Corporation

12

September 8, 2020

2.3

Analog Front End

2.3.1 Amplifier

The amplifier has a fully differential architecture and consists of two stages. The amplification of each stage and the external sensor gain polarity

section 3.6.2) in the MTP memory (see section 2.4.2). Only one of these two possible configurations is used for measurements. The default

configuration is SM_config1. Alternately, SM_config2 can be implemented by sending a command to select this configuration for the

measurement (see section 3.5.1). The term SM_config is used for general register content and functionality explanations for both, SM_config1

and SM_config2, as the registers’ bit assignments are exactly the same for both registers.

The first 6 bits of SM_config are the programmable gain settings Gain_stage1 and Gain_stage2. The options for the programmable gain settings

are listed in Table 2.1 and Table 2.2.

Table 2.1 Amplifier Gain: Stage 1

Gain_stage1

SM_config Bit G2

SM_config Bit G1

SM_config Bit G0

0

0

0

6

0

0

1

12

0

1

0

20

0

1

1

30

1

0

0

40

1

0

1

60

1

1

0

80

1

1

1

120

Table 2.2 Amplifier Gain: Stage 2

Gain_stage2

SM_config Bit G5 SM_config Bit G4 SM_config Bit G3

0

0

0

1.1

0

0

1

1.2

0

1

0

1.3

0

1

1

1.4

1

0

0

1.5

1

0

1

1.6

1

1

0

1.7

1

1

1

1.8