NXP Semiconductors PCA9846PW-ARD, User Manual, Page: 11 / 27

NXP Semiconductors
UM11759
PCA9846PW-ARD evaluation board
Figure 5. PCA9846PW-ARD – LDO 1 section
MUX1_LDO1_S2 MUX1_LDO1_S1 MUX1_LDO1_S0 VCC_LDOOUT1
Low Low Low 0.8 V
Low Low High 1.2 V
Low High Low 1.8 V
Low High High 2.5 V
High Low Low 3.3 V
High Low High
High High Low
High High High
3.6 V
Table 4. The VCC_LDOOUT1 voltages
4.4 EEPROM
Each channel of PCF9846 is connected to an EEPROM. Therefore, the board contains
four I
2
C memory ICs. Each EEPROM has its own voltage regulator (except U13, which is
supplied with 3.3 V directly from the Arduino port). This configuration allows testing of the
DUT behavior when working with I
2
C busses at different logic levels. Table 4 shows the
EEPROM ICs connected to I
2
C switch, along with their corresponding LDOs.
Channel (SDx, SCx) EEPROM RefDes LDO RefDes Voltage Circuit presented in:
Channel #1 (SD0, SC0) U10 U15 1.8 V
Figure 6
Channel #2 (SD1, SC1) U12 U16 2.5 V
Figure 7
Channel #3 (SD2, SC2) U13 - 3.3 V
Figure 8
Channel #4 (SD3, SC3) U14 U17 3.6 V
Figure 9
Table 5. VCCA programmable voltages
UM11759 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1 — 6 June 2022
11 / 27