diff --git a/ds248x/ds248x_test.go b/ds248x/ds248x_test.go
index e774e58..1eb8489 100644
--- a/ds248x/ds248x_test.go
+++ b/ds248x/ds248x_test.go
@@ -11,27 +11,78 @@ import (
 	"periph.io/x/conn/v3/i2c/i2ctest"
 )
 
-// TestNew sadly is testing only for DS2483.
-//
-func TestNew(t *testing.T) {
+// Testing function New for DS2483.
+func TestNew_DS2483(t *testing.T) {
 	bus := i2ctest.Playback{
+		DontPanic: true,
 		Ops: []i2ctest.IO{
 			{Addr: 0x18, W: []byte{0xf0}},
 			{Addr: 0x18, W: []byte{0xe1, 0xf0}, R: []byte{0x18}},
 			{Addr: 0x18, W: []byte{0xd2, 0xe1}, R: []byte{0x1}},
-			{Addr: 0x18, W: []byte{0xe1, 0xb4}},
-			// {Addr: 0x18, W: []byte{0xe1, 0xd2}}, // (DS2482-800)
-			// {Addr: 0x18, W: []byte{0xc3, 0xf0}}, // (DS2482-800)
+			{Addr: 0x18, W: []byte{0xe1, 0xb4}},                        // (DS2483 ptr for port configuration register)
 			{Addr: 0x18, W: []byte{0xc3, 0x6, 0x26, 0x46, 0x66, 0x86}}, // (DS2483)
 		},
 	}
 	d, err := New(&bus, 0x18, &DefaultOpts)
+	if s := d.String(); s != "DS2483{playback(24)}" {
+		t.Fatal(s)
+	}
 	if err != nil {
 		t.Fatal(err)
 	}
-	if s := d.String(); s != "DS2483{playback(24)}" {
+
+	if err := d.Halt(); err != nil {
+		t.Fatal(err)
+	}
+	if err := bus.Close(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Testing function New for DS2482-800.
+func TestNew_DS2482x800(t *testing.T) {
+	bus := i2ctest.Playback{
+		DontPanic: true,
+		Ops: []i2ctest.IO{
+			{Addr: 0x18, W: []byte{0xf0}},
+			{Addr: 0x18, W: []byte{0xe1, 0xf0}, R: []byte{0x18}},
+			{Addr: 0x18, W: []byte{0xd2, 0xe1}, R: []byte{0x1}},
+			{Addr: 0x18, W: []byte{0xe1, 0xd2}}, // (DS2482-800 ptr for channel selection register)
+			{Addr: 0x18, W: []byte{0xc3, 0xf0}}, // (DS2482-800)
+		},
+	}
+	d, err := New(&bus, 0x18, &DefaultOpts)
+	if s := d.String(); s != "DS2482-800{playback(24)}" {
+		t.Fatal(s)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := d.Halt(); err != nil {
+		t.Fatal(err)
+	}
+	if err := bus.Close(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Testing function New for DS2482-100.
+func TestNew_DS2482x100(t *testing.T) {
+	bus := i2ctest.Playback{
+		DontPanic: true,
+		Ops: []i2ctest.IO{
+			{Addr: 0x18, W: []byte{0xf0}},
+			{Addr: 0x18, W: []byte{0xe1, 0xf0}, R: []byte{0x18}},
+			{Addr: 0x18, W: []byte{0xd2, 0xe1}, R: []byte{0x1}},
+		},
+	}
+	d, err := New(&bus, 0x18, &DefaultOpts)
+	if s := d.String(); s != "DS2482-100{playback(24)}" {
 		t.Fatal(s)
 	}
+	if err != nil {
+		t.Fatal(err)
+	}
 	if err := d.Halt(); err != nil {
 		t.Fatal(err)
 	}