Spark Logic

DS1621 digital thermometer connection guide

DS1621 digital thermometer SO-8 · 150 mil wiring guide with power, signal assignments, and bench checks.

PDIP-8 · 300 mil 8 contacts
SO-8 · 208 mil 8 contacts

SO-8 · 150 mil

8 contacts Current package

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.

SO-8 · 150 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

3 · TOUT

Output · Outputs

Thermostat signal controlled by TH, TL and the output polarity bit.

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.

DS1621S
Narrow package identified in the datasheet pin drawing.