Spark Logic

DS1621 digital thermometer connection guide

DS1621 digital thermometer PDIP-8 · 300 mil wiring guide with power, signal assignments, and bench checks.

PDIP-8 · 300 mil

8 contacts Current package
SO-8 · 208 mil 8 contacts
SO-8 · 150 mil 8 contacts

Analog Devices / Maxim Integrated ·

Connect an I²C host

Required

Tie all address inputs low for address 0x48. Use this circuit to read temperature and leave TOUT open unless you need the thermostat signal.

R1 4.7 kΩ between +3.3 V and I²C data+3.3 VR1 4.7 kΩI²C data
R2 4.7 kΩ between +3.3 V and I²C clock+3.3 VR2 4.7 kΩI²C clock
C1 100 nF between +3.3 V and Ground+3.3 VC1 100 nFGround

Bench checks

  • Confirm an acknowledgement at 0x48. Send 0xEE, then poll bit 7 (DONE) with Access Config (0xAC).
  • Read both bytes using command 0xAA. Interpret the high nine bits as a signed value in units of 0.5 °C.

Analog Devices / Maxim DS1621 Rev. 4, pp. 1–5 and 8–12.

PDIP-8 · 300 mil wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Top view. Start at the package pin-1 index and follow the numbered leads.
Selected pin details

1 · SDA

Bidirectional · Bidirectional

Open-drain I²C data. The bus needs a pull-up to its logic rail.

Analog Devices / Maxim DS1621 Rev. 4, pp. 1–5 and 8–12.

Electrical limits · Pin in the reference

Models and documents

Package maps follow the manufacturer’s package drawings. Use the package code on the actual part to distinguish narrow and wide SO bodies.

DS1621+
Through-hole package.